03-12-2014, 02:16 PM
DENİZCİLİK İNGİLİZCESİ
1. ------------- is the first signal of lube- oil trouble.
A) Lube oil gravity tank low level alarm goes off
B) Low lube oil sump level
C) Low outlet temperature from lube oil coolers
D) No flow throught bull’s eye from gravity tank observed
E) A and B
2. -------------- is not one of the advantages of the open cooling system.
A) Being the simplest system
B) No requirement of heat exchange
C) Obligation of keeping engine cool
D) The requirement of only one water circulating pump
E) The requirement of 2 water circulating pumps
3. The TEV (thermostatic expansion valve) is located between:
A) The receiver and the king valve
B) The king valve and solenoid
C) Both A and B
D) The solenoid valve and evaporator
E) The charging valve and solenoid
4. What is the high pressure side of the refrigeration system?
A) Compressor to condenser
B) Evaporator to compressor
C) Expansion valve to evaporator
D) Compressor to expansion valve
E) Evaporator
5. The reciprocating motion of a connecting rod is transformed into a rotary motion by the:
A) Crankshaft
B) Crankwebs
C) Crank cheeks
D) Crankpine
E) Piston
6. What is the advantage of using a hydraulic starting system for an emergency diesel?
A) The system is inexpensive
B) High pressure lines are not required
C) It is compact
D) Faster cranking speeds are obtained
E) None of the above
7. What would cause white smoke after you just started the diesel?
A) Too week battery power
B) Water in the fuel
C) Water in the gas
D) Water in the oil
E) Salt water in cooling water
8. The turbocharger of an auxiliary diesel engine is most effected by:
A) Air inlet manifold pressure
B) Engine speed
C) Exhaust temperature
D) Engine load
E) None of the above
9. The coils in the evaporator are attached to the header by:
A) Pipe nipples
B) Union type fittings
C) Welding
D) Bolted flanges
E) Both C and D
10. The system used for breaking scale from the evaporator coil while the evaporator is in operation is called:
A) Recirculating
B) Blowing down
C) Cracking off
D) Dumping
E) None of above
11. Cylinder liner are generally used on diesel engines because:
A) Liners may be easily replaced after the cylinder walls show wear
B) Liners provide a more efficient cooling system
C) Rubbing speeds are reduced through the use of liners
D) Liners provide a better lubricating surface
E) None of the above
12. An over speeding diesel engine could best be stopped by:
A) Disconnecting the battery cables from the stating motor
B) Blocking the air intake and securing the fuel supply
C) A raining the hydraulic fluid from the governor sump
D) Blocking the flow of cooling air to the radiator
E) Both C and D
13. The valve which is always partially open when the evaporator is in operation is the:
A) Vapor valve
B) Continuous blowdown valve
C) Bottom blowdown valve
D) Surface blowdown valve
E) Bottom blowup valve
14. The dehydrator on a refrigeration plant is used to:
A) Add moisture to the system
B) Remove moisture from the system
C) Remove air from the system
D) Remove oil from the system
E) Both C and D
15. As freon leaves the expansion valve:
A) Pressure decreases – volume increases
B) Volume decreases – pressure increases
C) Volume increases – pressure increases
D) Pressure increases – volume decreases
E) None of the above
16. ---------------is the principal hazard to staff when a diesel nozzle tester is in use is
A) Electrical shock
B) Toxic fumes
C) Explosion
D) Blood poisoning
E) Loosing consciousness
17. The oil level in the compressor should be checked:
A) While the compressor is in operation
B) Just before starting the compressor
C) After a long period of operation
D) For both B and C
E) None of the above
18. What type of gauge reads pressure and vacuum?
A) Duplex
B) Simplex
C) Both B and C
D) Compound
E) Bourdon tube
19. Minor freon leaks can be detected by the use of a device called:
A) A freon visible leak detector
B) A freon audible leak detector
C) The blue oven flame detector
D) Halide torch
E) None of the above
20. Most gauges in the fire room are:
A) Manometers
B) Thermocouples
C) Dual purpose
D) Thermometers
E) Bourdon tube – type
21. If one fuel oil strainer of a duplex unit becomes clogged while your vessel is steaming at sea, you should first:
A) Clean the dirty strainer as quickly as possible
B) Change the strainer over to the clean side
C) Stop the fuel oil service pump
D) Open the strainer bypass valve
E) Stop the engine
22. The main characteristics of a diesel engine is:
A) internal combustion engine; the fuel is burned external of the cylinders
B) producing high power of energy
C) either 2 or 4 stroke, fuel is burned inside the cylinders
D) economical in compare with the steam engines, but hard maintenance
E) fixed sequence of events within its unique type
23. The sequence of events in a cycle within 4 stroke diesel engine is:
A) The piston is forced down at BDC (Bottom Dead Center) exhaust valve opens
B) The piston is at the top of its stroke, TDC (Top Dead Center), inlet valve opens, fresh air is drawn
C) Pressure is high in the gases
D) Fuel is injected as the piston reaches TDC, to start the combustion
E) Inlet valve opens, fresh air is drawn as the piston moves down
24. At the bottom of the stroke BDC inlet valve closes and the air in cylinder is compressed as the piston rises
A) 2-5-6-4-3-1
B) 2-5-6-4-1-3
C) 2-6-5-4-3-1
D) 5-2-4-6-3-1
E) 5-2-6-4-1-3
25. Pre- ignition can be caused by ------------------------- in an operating diesel engine.
A) Excessively late fuel injection
B) Oil in the air charge
C) Water in the fuel
D) Injection continuing after the fuel charge is ignited
E) None above
26. The upper section of a piston is called the:
A) Land
B) Skirt
C) Crown
D) Plate
E) Disk
27. What types of lubricating oil systems are used on diesel engines?
A) Forced feed and gravity
B) Forced feed and splash
C) Both A and B
D) Gravity and wick
E) Wet sump and dry sump
28. Before starting an auxiliary diesel engine, you should:
A) Change fuel oil strainers
B) Clean the air filter
C) Check the crankcase oil level
D) Vent the cooling system
E) Clean flywheel
29. The suction control switch on the compressor is a -------------------------
A) Thermal element
B) Thermostat
C) Pressure element
D) None above
E) All of above
30. By definition a separator: I. removes solids from the lube oil; II. re¬moves water from the lube oil.
A) I
B) II
C) I and II
D) Neither I nor II
E) Any of above
31. As Freon leaves the expansion valve...................................
A) Pressure increases – volume increases
B) Pressure decreases – volume increases
C) Pressure decreases – volume decreases
D) Pressure increases – volume decreases
E) Pressure increases – no change in the volume
32. A ball bearing will overheated if:
Completely full of grease
Half full of grease
In use for a long time
Operated at high speed
Operated at medium speed
33. Which of the following types of valves is used in the bilge manifold?
A) Swing check
B) Nonreturn
C) Angle
D) Globe
E) Butterfly
34. Before ballasting by gravity ----------------------------
A) Pump in ballast for about 10 minutes to wash out bottom lines
B) Start pump before opening sea valves
C) Make sure all proper valves are open
D) All of above
E) A and B
35. The process of supplying the intake of a diesel engine with air at a pressure greater than atmospheric is called:
A) Engine displacement
B) Scavenging
C) Air injection
D) Supercharging
E) Intercooling
36. In the simple mechanical governor, the:
A) Flyweight centrifugal force is balanced by spring pressure
B) Centrifugal force rotates the ball head
C) Flyweight centrifugal force is balanced by hydraulic pres sure
D) Speeder spring actuates the fuel control rod
E) Hydraulic force rotates the ball head
37. One horsepower equals ......
A) 1000 watts
B) 746 watts
C) 100 watts
D) 940 watts
E) 786 watts
38. Emergency generators are placed --------------------
A) Near the machinery space
B) Above the bulkhead or freeboard deck whichever the higher
C) Midships near the engine room casing
D) Above the deep load line
E) None above
39. ------------ is the first to do when securing an AC generator.
A) Tripping the generator circuit breaker
B) Switching the voltage regulator to manual
C) Decreasing the field excitation to minumum
D) Reducing the load on the unit
E) Increasing the load on the unit
40. In accordance with the international requirements, the bilge purifier will seperate oily water within the density of ....
A) < 15 particular per million
B) < 15 particular post million
C) < 15 particular per meter
D) ≤ 15 particular per meter
E) < 15 particular per billion
41. The requirement for portable fire equipment is ----------------------------
A) Annual check
B) Keeping in easily accessible places
C) Hose connections and keeping hoses in good condition
D) All above
E) Before the end of consuming period
42. With a reciprocating pump, failure to deliver liquid may be caused by ------------------
A) Pump not being primed
B) Discharge head too high
C) Liquid plunger packing worn
D) Any of the above
E) Only A and B
43. Which of the following isn’t a component of a water tube boiler?
A) burner
B) header
C) downcomer
D) steam drum
E) booster pump
44. The heat which is used to change a liquid to a gas or vapor is called latent heat of.................
A) Absorption
B) Fusion
C) Liquid
D) Evaporization
E) Fission
45. Prior to port arrival, a diesel alternator ...................... , turbo alternator ..................., and all the full away procedure should be done ..........................
A) Will have to be started/will be shut down/in reverse order
B) Doesnot have to be started/will have to be shut down/in reverse order
C) Will have to be started/will have to be started/in right order
D) Will have to be shut down/will have to be started/in reverse order
E) Doesn’t have to be shut down/will have to be shut down/in right order
46. When the separated oil is burnt by an....................., the application is recorded in Oil Record Book.
A) oily water separator
B) ejector
C) incinerator
D) chlorinator
E) aeration chamber
47. Fire detecting and extinguishing equipment is required on all ...............
A) Cargo vessels
B) Passenger vessels on international voyage
C) Vessels over 150 feet in length
D) Vessels over 450 feet in length
E) Cruise boats
48. Any automatic sprinkler, fire detection and fire alarm system shall be capable of immediate operation at all times and no action by the crew shall be necessary to set it in operation. Each section of sprinklers shall include means for giving a visual and audible alarm automatically whenever any sprinkler comes into operation. Sprinklers shall be grouped into separate sections, each of which shall contain not more than 200 sprinklers. Each section shall be capable of being isolated by one stop valve only. A gauge indicating the pressure in the system shall be provided at each section stop valve and a central station. The sprinklers shall be resistant to corrosion by marine atmosphere. In accommodation and service spaces the sprinklers shall come into operation within the temperature range from 68°C to 79°C. A list or plan shall be displayed at each unit and suitable instructions for testing and maintenance shall be available. Sprinklers shall be placed in an overhead position to maintain an average application rate of not less than 5 l/m²/min over the area covered by the sprinklers.
According to the passage, it isn’t true that;
A) The sprinklers can be affected by marine atmosphere.
B) They will be in an overhead position to maintain the average application.
C) The pressure in the system is displayed by a pressure gauge
D) Sprinkler system is used either fixed or mobile on board.
E) The system shall be divided into sections.
49. The process of supplying the intake of a diesel engine with air at a pressure greater than atmospheric is called:
A) Engine displacement
B) Scavenging
C) Air injection
D) Supercharging
E) Intercooling
50. In the simple mechanical governor, the:
A) Flyweight centrifugal force is balanced by spring pressure
B) Centrifugal force rotates the ball head
C) Flyweight centrifugal force is balanced by hydraulic pres sure
D) Speeder spring actuates the fuel control rod
E) Hydraulic force rotates the ball head
51. In case of burning of radio equipments on the bridge the extinguishers should be the same as the ones to be used in ........................... fires, keeping in mind that the fire will turn out tobe a ....................... fire when starting firefighting takes long.
A) Class E/Class A
B) Class E/Class B
C) Class B/Class A
D) Class C/Class A
E) Class C/Class E
52. “The quantity of oil in separated water is controlled by a control unit.”
What sentence below has the same meaning?
A) Control unit controls the oil quantity and separate it.
B) The quantity of oil is separated and controlled by control unit
C) The oil quantity in water is separated by control unit
D) Control unit controls the oil quantity in separated water.
E) Separated water in oil is controlled by control unit.
53. Blue smoke coming from the diesel exhaust would indicate:
A) Excessive fuel consumption/unburned fuel
B) Burning of lube oil due to possible blow-by
C) Lean fuel/air mixture, too much air
D) Insufficient amount of fuel consumption
E) None of the above
54. The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an:
A) Air compressor
B) Diffuser
C) Filter
D) Venturi
E) Aftercooler
55. Another name for the liquid valve is:
A) Master valve
B) King valve
C) Freon valve
D) Shut off valve
E) None of above
56. The turbocharger of an auxiliary diesel engine is most effected by:
A) Air inlet manifold pressure
B) Engine speed
C) Exhaust temperature
D) Engine load
E) None of the above
57. The coils in the evaporator are attached to the header by:
A) Pipe nipples
B) Union type fittings
C) Welding
D) Bolted flanges
E) Both C and D
58. An electric heater built into the cylinder water jacket would be used to:
A) Raise lube oil viscosity for easier starting in cold weather
B) Increase air inlet temperature
C) Increase compression ratio
D) Increase jacketwater temperature for easier starting in cold weather
E) Heating compressed air
59. Most gauges in the fire room are:
A) Manometers
B) Thermocouples
C) Dual purpose
D) Thermometers
E) Bourdon tube – type
60. How often should the emergency diesel be run under load?
A) Once a year
B) Once a month
C) Once a week
D) At survey time only
E) At drydock
61. Which one is not identical with the characteristics of the construction of a-2-stroke diesel engines?
A) Instead of valve holes, ports are installed
B) A cycle is completed in 2 strokes of the piston
C) Produce high power in compare with 4 stroke engines
D) The maintenance is simple
E) A cycle is completed in 2 revolution of the crackcase
62. Which of the following is not one of the parts of D/G overhaul?
A) Valve rotator
B) Valve spindle
C) Intake valve
D) Valve seat
E) Starting valve
63. Scavenging means --------------------------- on an internal combustion engines.
B) The removal of exhaust gases by blowing in fresh air
The filling of the engine cylinder with a supply or change of fresh air
The formation of exhaust gases within the cylinder
The removal of exhaust gases
Any above
64. The upper section of a piston is called the:
A) Land
B) Skirt
C) Crown
D) Plate
E) Disk
65. What types of lubricating oil systems are used on diesel engines?
A) Forced feed and gravity
B) Forced feed and splash
C) Both A and B
D) Gravity and wick
E) Wet sump and dry sump
66. Having an unstarting compressor must make you think the possibiliy of .................
A) No charge of liquid in the system
B) Closed solenoid valves
C) A and B
D) None above
E) Having sufficient amount of air
67. The purpose of an evaporator is to ......
A) Transmit the latent heat of fusion
B) Transmit the latent heat of evaporation
C) Absorb the latent heat of evaporation
D) Absorb the latent heat of fusion
E) Any above
68. ................is a process , in which the temperature of a space on whatever takes place in, is reduced below that of their surroundings.
A) Refrigeration
B) Air conditioning
C) Ventilation
D) Heating
E) Freezing
69. An overheated bearing in the main propulsion unit is indicated by:
A) Bubbles in the sight glass
B) Sludge in the strainers
C) A high oil level in the sump
D) Low temperature of the lube oil leaving the bearing
E) High temperature of the lube oil leaving the bearing
70. The liner which has no direct contact with the cooling water is what kind of a liner?
A) Wet
B) Dry
C) Integral
D) None of the above
E) Cooled with lubrication oil
71. The function of the exhaust system for a turbocharged diesel engine is to --------------
A) Power the aftercoolers
B) Power the turbocharger
C) Reduce the cylinder scavenge effect
D) Cool the turbocharger
E) Any above
72. A fire sprinkling system must be fitted......................
A) On all vessels over 5.000. GT
B) In conjunction with the CO2 system (x)
C) With a pressure tank of fresh water to the supply system pending the starting of the pump
D) None of the above
E) A and C
73. Under normal operational conditrons, the rudder is hydraullically locked unless...........
A) The manual trick wheel is engaged for steering
B) The pupm is off stroke
C) A normal rudder order is given by the control system
D) An electric power failure occurs at the steering gear
E) A and B
74. Static electricity is most often produced by ----------------------
A) Pressure
B) Heat
C) Magnetism
D) Friction
E) Motion
75. When vacuum is lost on a turbo generator the trip is actuated by -------------------
A) Sentinel valve
B) Back pressure
C) Slugs of water
D) Overspeed trip
E) A and B
76. Emergency generators can be stopped via -----------------
A) Ovelvoltage trip
B) Overspeed trip
C) Manual trip
D) Undervoltage
E) Any above
77. Supposing a fire caused by short electric circuit within the equipments is categorized as a ............................ fire and will be extinguished vıa .....................................
A) Class A/foam
B) Class C/chemical powder
C) Class C/CO2
D) Class B/foam
E) Class A/chemical powder
78. 1 In accordance with the international requirements, the bilge purifier will seperate oily water within the density of ……..
A) < 15 particular per million
B) < 15 particular post million
C) < 15 particular per meter
D) ≤ 15 particular per meter
E) < 15 particular per billion
79. -------is used as a fire extinguisher in case of fires resulted from electrical equipment.
A) Soda acid
B) CO 2
C) Sand
D) Foam
E) C and D
80. The removal of contaminating impurities from lubricating oil will ......................
A) Increase engine wear
B) Decrease engine wear
C) Increase possible breakdowns
D) Decrease possible breakdowns
E) B and D
81. Cut out system on the aux boiler operates ................................
A) Low level alarm
B) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
82. ---------------is the cause of burned exhaust valves
A) Overloaded cylinder
B) Poor combustion
C) Distortion and faulty reseating maintenance
D) Any above
E) A and B
83. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
A) Pumping only if discharge is led to a shore tank or barge
B) Pumping only during the hours of darkness
C) Pumping only on the outgoing tide
D) Pumping only as much as is necessary
E) Pumping only the day hours
84. Sediment collects in a tubular purifier:
A) On top cover
B) In drain line
C) On sides of bowl
D) On the discs
E) None of above
85. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
A) Buffer springs
B) Follow up mechanism
C) Relief valves
D) Relieving gear
E) Steering pumps
86. Blue smoke coming from the diesel exhaust would indicate:
F) Excessive fuel consumption/unburned fuel
G) Burning of lube oil due to possible blow-by
H) Lean fuel/air mixture, too much air
İ) Insufficient amount of fuel consumption
J) None of the above
87. The valve which is always partially open when the evaporator is in operation is the:
A) Vapor valve
B) Continuous blowdown valve
C) Bottom blowdown valve
D) Surface blowdown valve
E) Fresh water valve
88. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
89. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
90. What harmful consequence can result from sludge in the lube oil system of a trunk piston diesel engine?
A) Clogged oil pump suction screens
B) Increased oil temperature
C) Stuck piston rings
D) Any of the above
E) None of the above
91. Trunk type diesel engine pistons are most effectively cooled when heat is:
A) Radiated through the engine block
B) Mixed with lubrication oil
C) Conducted through the piston crown
D) Transferred to escaping exhaust gases
E) Transferred to water cooled cylinder walls
92. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
A) A loss of thrust
B) Erosion of the blade surface
C) Vibrations in the afterbody of the ship
D) Noise
E) All above
93. When the oil in the seperator is decreasing, which place cannot be leaking?
A) Lower bearing casing
B) Drum shaft
C) Wormgear shaft bearing hosing
D) Middle ball bearing casing
E) The o-ring at shock water entrance to seperator into shockwater
94. -------------should be regarded as a special attention after installing a new hydraulic pump.
The relief filters should be readjusted
B) The filters and strainers should be checked frequently
System pressures should be readjusted
The fluid should be drained and renewed
All above
95. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
A) Rough log
B) Engine room log
C) Oil record book
D) Smooth log
E) A and B
96. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
A) Chief Engineer
B) 2nd Engineer
C) Boatswain
D) 2nd officer
E) Any above organization
97. A spring bearing on the line shaft is lubricated by :
A) The lube oil gravity tank
B) Water leak off from the stern tube
C) An oil ring and scraper
D) The main lube oil pump
E) Any above
98. An electric heater built into the cylinder water jacket would be used to:
F) Raise lube oil viscosity for easier starting in cold weather
G) Increase air inlet temperature
H) Increase compression ratio
İ) Increase jacketwater temperature for easier starting in cold weather
J) Heating compressed air
99. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
A) Purge the condenser
B) Remove refrigerant
C) Adjust the thermostatic expansion valve
D) Increase the compressor speed
E) Add refrigerant
100. This gauge measures both inlet and outlet pressures of a strainer:
A) A compound gauge
B) A duplex gauge
C) A biogauge
D) A pressure / vacuum gauge
E) None of the above
101. In a 4 stroke engine 2 revolution of the crank is completed within.the angle of --------
A) 7200
B) 3600
C) 1800
D) 900
E) 450
102. What will happen to a small diesel engine that is equipped with an “auto type” thermostat if the bellows develop a hole in it?
A) The engine will overheat
B) The engine will remain cold
C) The engine will remain not start
D) The cooling water will “by pass” the engine
E) None of the above
103. When does a two stroke cycle diesel engine produce a power stroke in each cylinder?
A) Once in every 2 revolutions of the crankshaft
B) Once for every 4 stroke of the piston
C) Once for every 2 stroke of the piston
D) Directly after the exhaust stroke
E) None of the above
104. ..................are the common parts within the 2 and 4 stroke diesel engines.
A) Piston, valves, cylinder, fuel injector
B) Crankshaft, crosshead, cylinder
C) Turbocharger, piston, gudgeonpin, cylinder
D) Crankshaft, connecting rod, pistons
E) Cylinder; connecting rod, pistons
105. Blue smoke coming from the diesel exhaust would indicate:
A) Excessive fuel consumption / unburned fuel
B) Burning of lube oil due to possible blow by
C) Lean fuel / air mixture, too much air
D) Less amount of fuel consumption
E) None of the above
106. All diesel lubricating system must:
A) Have a forced feed mechanical lubricator
B) Prevent oil fog in the crankcase to avoid crankcase explosion
C) Provide oil for cooling the piston and cylinder wall
D) Provide a film of oil between the piston and cylinder wall
E) None of the above
107. All of the following are used for low temperature starting, except:
A) Ether
B) Jacket water heaters
C) Both A and B
D) Air intake heaters
E) Cylinder compression ratio reduced
108. Which of the following is highly advised to be used for washing turbo charger blower by the manifacturers?
A) Hotwater
ACC9+Hot water
Filter clean+hotwater
Carbon remover+hot water
Descalex liquid+ hot water
109. If the flow of water from a centrifugal pump is stopped by closing the discharge valve with the pump running:
A) The relief valve will open
B) The water pressure will stabilize at shut off head
C) The water pressure will tend to rise continuously
D) The driver will be over loaded
E) The water temperature will tend to decrease continuously
110. Which factor below is not the cause of vibration and noise in turbines?
A) Unbalance
B) Dıstortion of casing
C) Loose couplings
D) Tight couplings
E) Any above
111. The drains from both effects in a low pressure evaporator have their pressures equalized in the:
A) Equalizer tank
B) Drain tank
C) Flash chamber
D) Air ejector condense
E) Fuel oil tank
112. The second effect on a two pass evaporator receives its steam from:
A) De-superheated steam
B) Vapors from first effect
C) Auxiliary back pressure
D) Auxiliary forward pressure
E) None of the above
113. When purging a refrigeration system, the compressor is ………………
A) Running
B) Running with the bypass open
C) Shut down
D) Running with the bypass closed
E) Running steadily
114. All refrigerator compressor valves are opened and closed via ………….
A) Springs
B) Camshaft
C) Pressure differential
D) A or C
E) None above
115. Prior to port arrival, a diesel alternator ...................... , turbo alternator ..................., and all the full away procedure should be done ..........................
A) Will have to be started/will be shut down/in reverse order
B) Doesnot have to be started/will have to be shut down/in reverse order
C) Will have to be started/will have to be started/in right order
D) Will have to be shut down/will have to be started/in reverse order
E) Doesn’t have to be shut down/will have to be shut down/in right order
116. When oil is heated, it becomes ......
A) Less viscous
B) Emulsified
C) More viscous
D) Vitrified
E) Not necessarly vitrified
117. Low head pressure can be caused by ........
A) Too much condensing water
A) Too cold condensing water
B) Leaky discharge valves
C) Insufficient change of refrigerant
D) Any of the above
118. --------is hardly the cause of a smoky diesel engine exhaust.
A) Overload
B) Malfunctioned injector
C) Choked exhaust pipe
D) Inappropriate amount of fuel
E) Appropriate amount of fuel
119. Flashlights used aboard tankers must be........
A) Waterproof
B) Of the three cell type
C) Approved by the Board of fire underwriters
D) All above
E) A and C
120. The usual cause of crankcase explosions in diesel engines is not -----------------------
A) Heating lubricating oil
B) Overheating lubricating oil
C) Poor condition of the cylinder
D) Crank shaft bearing failures maintenance
E) Any above
121. The low pressure side of a refrigeration system is from the:
C) Expansion valve to compressor
D) Compressor to expansion valve
E) Expansion valve to the evaporator
F) Condenser to the expansion valve
G) None of the above
122. Pre combustion chambers in a diesel engine:
A) Require that each cylinder use two spray nozzles
B) Require the use of flat crowned pistons to obtain turbulence
C) Permit the use of a wide range of fuel in that engine
D) Contain all of the air charge at the end of the compression stroke
E) Require that each cylinder use more than four spray nozzles
123. Refrigerant leakage from the compressor crankcase is prevented by ----------------
A) Using skirt type pistons
B) Using shaftseals
C) Using lantern rings
D) Maintaining a vacuum in the crankcase
E) Any above
124. The system used for breaking scale from the evaporator coil while the evaporator is in operation is called:
A) Recirculating
B) Blowing down
C) Cracking off
D) Dumping
E) None of above
125. As freon leaves the expansion valve:
A) Pressure decreases – volume increases
B) Volume decreases – pressure increases
C) Volume increases – pressure increases
D) Pressure increases – volume decreases
E) None of the above
126. In a diesel engine closed cooling system, the flow of fresh water through the fresh water and lube oil coolers is controlled by the:
A) Speed of the engine
B) Speed of the pump impeller
C) Automatic temperature regulator
D) Suction pressure regulator
E) Governor
127. A “pneumercator” measures:
A) Oil pressure
B) Air level
C) Liquid level
D) Air pressure
E) Air temperature
128. What type of gauge reads pressure and vacuum?
A) Duplex
B) Simplex
C) Both B and C
D) Compound
E) Bourdon tube
129. Minor freon leaks can be detected by the use of a device called:
A) A freon visible leak detector
B) A freon audible leak detector
C) The blue oven flame detector
D) Halide torch
E) None of the above
130. The lubricant is expected to have the qualities of ....................................
A) Preventing metal-to metal contact
B) Causing metal to metal contact
C) Decrease friction
D) Decrease friction wear
E) All expect B
131. If one cylinder was getting more fuel than others the effect will be ---------------------
A) That cylinder’s being overloaded
B) The exhaust valve’s being overheated
C) Average compression
D) Incomplete combustion
E) Complete combustion
132. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
F) Pumping only if discharge is led to a shore tank or barge
G) Pumping only during the hours of darkness
H) Pumping only on the outgoing tide
İ) Pumping only as much as is necessary
J) Pumping only the day hours
133. A propulsion diesel engine is normally shut down by ----------------------------
A) Shutting off the air supply
B) Overspeeding the engine
C) Securing the fuel supply
D) Securing the ignition system
E) All above
134. Sediment collects in a tubular purifier:
F) On top cover
G) In drain line
H) On sides of bowl
İ) On the discs
J) None of above
135. “Water hammer” is caused by:
A) Hitting water pipe with hammer
B) Too much water in pipe line system
C) Water in steam lines
D) Steam in water lines
E) Few amount of water in pipe line system
136. The valve which is always partially open when the evaporator is in operation is the:
F) Vapor valve
G) Continuous blowdown valve
H) Bottom blowdown valve
İ) Surface blowdown valve
J) Fresh water valve
137. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
H) Heat resistant
Hard finished
Half threaded
Corrosion resistant
Fire proof
138. The rotating part of a micrometer is the:
A) Anvil
B) Barrel
C) Frame
D) Thimble
E) Cover
139. An advantage of aluminum pistons compared to cast iron pistons is:
A) Greater high temperature strength
B) Greater weight per cubic meter
C) Increased resistance to wear
D) Low temperature strength
E) Better heat conductivity
140. Trunk type diesel engine pistons are most effectively cooled when heat is:
F) Radiated through the engine block
G) Mixed with lubrication oil
H) Conducted through the piston crown
İ) Transferred to escaping exhaust gases
J) Transferred to water cooled cylinder walls
141. Insufficient refrigerant in a refrigeration plant on board a ship may result in:
A) High discharge pressure
B) Frosting of the crankcase
C) High temperature of the overboard water
D) Low suction pressure
E) Low temperature of the sea water
142. .................. should be considered as a hazard on the propeller and a thorough examination and repair will be carried out when the vessel is in dry dock.
A) Bent blades
B) Signs of cracks on the blade edge
C) Deep pits and holes
D) Edge cracks
E) All above
143. Considering the fuel, ignition quality is determined by ....................................
A) Cetane number
B) Diesel index
C) Calculated cetane index
D) Flash point
E) All except D
144. When operating at high or low speed in the use of nozzles in a turbine, attention and precaution must be taken that ............................
The nozzles in use should be wide open
Operation with a few nozzles as it’s economical
The nozzles not in use must be tightly closed
B) All above
C) Only A and B
145. ---------------------protects the pump shafts from erosion, corrosion and wear
A) Wearing rings
B) Renewable sleeves
C) A hardened metal coating
D) Internally flooded lantern rings
E) Lantern rings
146. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
F) Chief Engineer
G) 2nd Engineer
H) Boatswain
İ) 2nd officer
J) Any above organization
147. Performance of a turbocharged engine can be improved by:
A) Decreasing valve over lap
B) Preheating
C) Aftercooling intake air
D) Preheating light fuels
E) Heating intake air
148. When maneuvering, you discover heavy smoke coming from the turbocharger casing. You should:
A) Check the air filter for dirt
B) Check for an exhaust leak
C) Check the cooling water temperature
D) Notify the bridge and ask to shut the engine down
E) Check fuel oil consumption
149. A device which will function to bring an engine to a full stop in order to protect it from damage due to excessively high speed is known as a/an:
A) Torque limiter
B) Overspeed trip
C) Overspeed governor
D) Load limit governor
E) Any of above
150. The removal of contaminating impurities from lubricating oil will ......................
F) Increase engine wear
G) Decrease engine wear
H) Increase possible breakdowns
İ) Decrease possible breakdowns
J) B and D
151. Cut out system on the aux boiler operates ................................
A) Low level alarm
B) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
152. ---------------is the cause of burned exhaust valves
F) Overloaded cylinder
G) Poor combustion
H) Distortion and faulty reseating maintenance
İ) Any above
J) A and B
153. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
K) Pumping only if discharge is led to a shore tank or barge
L) Pumping only during the hours of darkness
M) Pumping only on the outgoing tide
N) Pumping only as much as is necessary
O) Pumping only the day hours
154. Sediment collects in a tubular purifier:
K) On top cover
L) In drain line
M) On sides of bowl
N) On the discs
O) None of above
155. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
F) Buffer springs
G) Follow up mechanism
H) Relief valves
İ) Relieving gear
J) Steering pumps
156. Blue smoke coming from the diesel exhaust would indicate:
K) Excessive fuel consumption/unburned fuel
L) Burning of lube oil due to possible blow-by
M) Lean fuel/air mixture, too much air
N) Insufficient amount of fuel consumption
O) None of the above
157. The valve which is always partially open when the evaporator is in operation is the:
K) Vapor valve
L) Continuous blowdown valve
M) Bottom blowdown valve
N) Surface blowdown valve
O) Fresh water valve
158. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
İ) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
159. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
160. What harmful consequence can result from sludge in the lube oil system of a trunk piston diesel engine?
F) Clogged oil pump suction screens
G) Increased oil temperature
H) Stuck piston rings
İ) Any of the above
J) None of the above
161. Trunk type diesel engine pistons are most effectively cooled when heat is:
K) Radiated through the engine block
L) Mixed with lubrication oil
M) Conducted through the piston crown
N) Transferred to escaping exhaust gases
O) Transferred to water cooled cylinder walls
162. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
F) A loss of thrust
G) Erosion of the blade surface
H) Vibrations in the afterbody of the ship
İ) Noise
J) All above
163. When the oil in the seperator is decreasing, which place cannot be leaking?
F) Lower bearing casing
G) Drum shaft
H) Wormgear shaft bearing hosing
İ) Middle ball bearing casing
J) The o-ring at shock water entrance to seperator into shockwater
164. -------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
165. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
F) Rough log
G) Engine room log
H) Oil record book
İ) Smooth log
J) A and B
166. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
K) Chief Engineer
L) 2nd Engineer
M) Boatswain
N) 2nd officer
O) Any above organization
167. A spring bearing on the line shaft is lubricated by :
A) The lube oil gravity tank
B) Water leak off from the stern tube
C) An oil ring and scraper
D) The main lube oil pump
E) Any above
168. An electric heater built into the cylinder water jacket would be used to:
K) Raise lube oil viscosity for easier starting in cold weather
L) Increase air inlet temperature
M) Increase compression ratio
N) Increase jacketwater temperature for easier starting in cold weather
O) Heating compressed air
169. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
F) Purge the condenser
G) Remove refrigerant
H) Adjust the thermostatic expansion valve
İ) Increase the compressor speed
J) Add refrigerant
170. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
171. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
172. The rotating part of a micrometer is the:
F) Anvil
G) Barrel
H) Frame
İ) Thimble
J) Cover
173. An advantage of aluminum pistons compared to cast iron pistons is:
F) Greater high temperature strength
G) Greater weight per cubic meter
H) Increased resistance to wear
İ) Low temperature strength
J) Better heat conductivity
174. Trunk type diesel engine pistons are most effectively cooled when heat is:
P) Radiated through the engine block
Q) Mixed with lubrication oil
R) Conducted through the piston crown
S) Transferred to escaping exhaust gases
T) Transferred to water cooled cylinder walls
175. Insufficient refrigerant in a refrigeration plant on board a ship may result in:
F) High discharge pressure
G) Frosting of the crankcase
H) High temperature of the overboard water
İ) Low suction pressure
J) Low temperature of the sea water
176. The removal of contaminating impurities from lubricating oil will ......................
K) Increase engine wear
L) Decrease engine wear
M) Increase possible breakdowns
N) Decrease possible breakdowns
O) B and D
177. The lubricant is expected to have the qualities of ....................................
F) Preventing metal-to metal contact
G) Causing metal to metal contact
H) Decrease friction
İ) Decrease friction wear
J) All expect B
178. If one cylinder was getting more fuel than others the effect will be ---------------------
F) That cylinder’s being overloaded
G) The exhaust valve’s being overheated
H) Average compression
İ) Incomplete combustion
J) Complete combustion
179. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
P) Pumping only if discharge is led to a shore tank or barge
Q) Pumping only during the hours of darkness
R) Pumping only on the outgoing tide
S) Pumping only as much as is necessary
T) Pumping only the day hours
180. A propulsion diesel engine is normally shut down by ----------------------------
F) Shutting off the air supply
G) Overspeeding the engine
H) Securing the fuel supply
İ) Securing the ignition system
J) All above
181. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
K) Buffer springs
L) Follow up mechanism
M) Relief valves
N) Relieving gear
O) Steering pumps
182. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
P) Chief Engineer
Q) 2nd Engineer
R) Boatswain
S) 2nd officer
T) Any above organization
183. An electric heater built into the cylinder water jacket would be used to:
P) Raise lube oil viscosity for easier starting in cold weather
Q) Increase air inlet temperature
R) Increase compression ratio
S) Increase jacketwater temperature for easier starting in cold weather
T) Heating compressed air
184. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
K) Purge the condenser
L) Remove refrigerant
M) Adjust the thermostatic expansion valve
N) Increase the compressor speed
O) Add refrigerant
185. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
K) A loss of thrust
L) Erosion of the blade surface
M) Vibrations in the afterbody of the ship
N) Noise
O) All above
186. Considering the fuel, ignition quality is determined by ....................................
F) Cetane number
G) Diesel index
H) Calculated cetane index
İ) Flash point
J) All except D
187. When the oil in the seperator is decreasing, which place cannot be leaking?
K) Lower bearing casing
L) Drum shaft
M) Wormgear shaft bearing hosing
N) Middle ball bearing casing
O) The o-ring at shock water entrance to seperator into shockwater
188. -------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
189. ---------------------protects the pump shafts from erosion, corrosion and wear
F) Wearing rings
G) Renewable sleeves
H) A hardened metal coating
İ) Internally flooded lantern rings
J) Lantern rings
190. The removal of contaminating impurities from lubricating oil will ......................
P) Increase engine wear
Q) Decrease engine wear
R) Increase possible breakdowns
S) Decrease possible breakdowns
T) B and D
191. Cut out system on the aux boiler operates ................................
A) Low level alarm
A) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
192. ---------------is the cause of burned exhaust valves
K) Overloaded cylinder
L) Poor combustion
M) Distortion and faulty reseating maintenance
N) Any above
O) A and B
193. When a cargo hose joint or coupling starts to leak badly the attempt you should do is to...
A) Reduce pumping pressure and wrag leak securely
B) Shut down transfer and make repairs
C) Soak spill with sawdust and reduce pumping pressure
D) Wash deck immediately and close tank tops
E) Carry on transfer
194. Water in the lube oil system may be detected by: I. sounding lube oil tanks with water sensitive paste; II. observing the purifier discharge.
A) I
B) II
C) I and II
D) Neither I nor II
E) None of above
195. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
P) Buffer springs
Q) Follow up mechanism
R) Relief valves
S) Relieving gear
T) Steering pumps
196. Blue smoke coming from the diesel exhaust would indicate:
P) Excessive fuel consumption/unburned fuel
Q) Burning of lube oil due to possible blow-by
R) Lean fuel/air mixture, too much air
S) Insufficient amount of fuel consumption
T) None of the above
197. The valve which is always partially open when the evaporator is in operation is the:
P) Vapor valve
Q) Continuous blowdown valve
R) Bottom blowdown valve
S) Surface blowdown valve
T) Fresh water valve
198. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
J) A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
199. The rotating part of a micrometer is the:
K) Anvil
L) Barrel
M) Frame
N) Thimble
O) Cover
200. An advantage of aluminum pistons compared to cast iron pistons is:
K) Greater high temperature strength
L) Greater weight per cubic meter
M) Increased resistance to wear
N) Low temperature strength
O) Better heat conductivity
201. Trunk type diesel engine pistons are most effectively cooled when heat is:
U) Radiated through the engine block
V) Mixed with lubrication oil
W) Conducted through the piston crown
X) Transferred to escaping exhaust gases
Y) Transferred to water cooled cylinder walls
202. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
P) A loss of thrust
Q) Erosion of the blade surface
R) Vibrations in the afterbody of the ship
S) Noise
T) All above
203. When the oil in the seperator is decreasing, which place cannot be leaking?
P) Lower bearing casing
Q) Drum shaft
R) Wormgear shaft bearing hosing
S) Middle ball bearing casing
T) The o-ring at shock water entrance to seperator into shockwater
204. ------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
205. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
K) Rough log
L) Engine room log
M) Oil record book
N) Smooth log
O) A and B
206. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
U) Chief Engineer
V) 2nd Engineer
W) Boatswain
X) 2nd officer
Y) Any above organization
207. Performance of a turbocharged engine can be improved by:
F) Decreasing valve over lap
G) Preheating
H) Aftercooling intake air
İ) Preheating light fuels
J) Heating intake air
208. When maneuvering, you discover heavy smoke coming from the turbocharger casing. You should:
F) Check the air filter for dirt
G) Check for an exhaust leak
H) Check the cooling water temperature
İ) Notify the bridge and ask to shut the engine down
J) Check fuel oil consumption
209. A device which will function to bring an engine to a full stop in order to protect it from damage due to excessively high speed is known as a/an:
F) Torque limiter
G) Overspeed trip
H) Overspeed governor
İ) Load limit governor
J) Any of above
210. The bulb for the TEV (thermostatic expansion valve) is located:
A) In the middle of the evaporator coils
B) Near the evaporator coil outlet
C) Near the evaporator coil inlet
D) On the bottom row of the evaporator
E) None of the above
211. The solenoid valve can be typed as a:
A) Thermal valve
B) Magnetic stop valve
C) Bellows valve
D) Bimetallic valve
E) Both C and D
212. Worn bearings, rings, and valves all contribute to:
A) Poor reversal
B) Quiet operation
C) Hard starting
D) High pressure
E) None of the above
213. Regardless of the geographical location of on oil spill, you should notify the ---------------
A) Local police department
B) Local fire department
C) Corps of Engineers
D) Coast Guard
E) The pilot
214. The valve which is always partially open when the evaporator is in operation is the:
U) Vapor valve
V) Continuous blowdown valve
W) Bottom blowdown valve
X) Surface blowdown valve
Y) Fresh water valve
215. On a diesel engine, a freshwater heat exchanger is used rather than a saltwater one to:
A) Maintain fuel oil temperature
B) Maintain lube oil temperature
C) Cut down on rust and corrosion
D) Keep the engine block from freezing in cold weather
E) Maintain air temperature
216. If a bilge pump failed to build up discharge pressure, you should check for:
A) Excessive water in the bilges
B) A clogged suction strainer
C) Oil in the bilges
D) A closed skin valve
E) None of the above
217. Emulsification of oil will occur when mixed with:
A) Air
B) Water
C) Black oil
D) Ice cream
E) Oxygen
218. Any electric motor can be constructed to be --------------------proof.
A) Short
B) Ground
C) Explosion
D) Overload
E) A and B
REFRIGERATION QUESTIONS
219. Low head pressure can be caused by:
A- too mach or too cold cndensing water
B- Leaky discharge valves
C- Insuficient charge refrigerant
D- Any of above
220. If the termostatic expantion valve did not appear to be functioning
properly,the cause could be:
A- foreing matter in the valve
B- ruptured control bulb tubbing
C- moisture in the system
D- any of above
221. The density of the brane solution is measured with:
A- litmus paper
B- chemical test
C- a hydrometer
D- A or B
222 . which of the following would not be cause for a refrigerating system to short cycle on HP cutout
A- discharge valve leaking
B- pressure cutout set incorrectly
C- system overcharged with refrigerant
D- insufficient cooling water
223. excessive head pressure is caused by:
A- air or noncndensable gas in the system
B- dirty condencer tubes
C- insufficient cooling water to condencer
D- any of above
224. The capaciti of a centrifugal type compressor is controlled by:
A- regulating the discharge pressure
B- regulating the speed
C- regulating the suction pressure
D- B or C
225. Solenoid coil is installed:
A- vertically above the valve
B- horizantally above the valve
C- vertically below the valve
D- horizontally below the valve
226. when purging refrigeration system,compressor is:
A- running
B- running but condencer secured
C- shut down
D- running with the bypass open
227. when opening single packed stop valve
A- loosen packing before opening
B- tighten packing before opening
C- check to see that the seal is not scored
D- non of the above
228. Excessive head pressure is caused by:
A- flooded condencer tube
B- too mach cooling water to condencer
C- cooling water temperature too high
D- A or C
229. Everything is in its normal operation position when charging a system except the:
A- compressor discharge valve
B- purge valve
C- solenoid valve
D- king (receiver discharge) valve
230. when making repairs to refridgeration system, which of the following safety precautions is not necessery
A- vantilate area
B- have O.B.A. avilable
C- keep flame and open light away
D- wear goggles
231. A hot suction line may be caused by:
A- lack of the refrigerant
B- insufficient condensing cooling water
C- excess refrigeration
D- B or C
232. Both temperature and pressure increased in the:
A- compressor
B- condencer
C- evaporator
D- B or C
233. The refrigerant temperature is at its maximum just before it enters the:
A- expantion valve
B- compressor
C- condenser
D- evaporatior
234. The greatest decrease in refrigerant temperature occurs in the:
A- evaporator
B- compressor
C- condenser
D- A or C
235. Storage tank for liquid refrigerant is called as:
A- receiver tank
B- charging tank
C- purging tank
D- any of the above
236. Precooler is sometimes installed between the:
A- compressor and condenser
B- condencer and expantion valve
C- expantion valve and evaporator
D- evaporator and compressor
237. the solenoid valve controls the:
A- pressure in the evaporator coils
B- amount of the refrigerant entering the evaporator
C- flow of refrigerant to the expantion valve
D- amount of circulating water to the condenser
238. Closing solenoid valve will stop the compressor through the:
A- low water pressure cutout switch
B- bypass releif valve
C- low-pressure cutout switch
D- high pressure cutout switch
239. Four basic methods of the detarmaining wether the proper amont of refigerant being added to the system are:
A- bull’s –eye weight,pressure and frost line
B- temperature,weight,pressure and frost line
C- bull’s –eye, weight,pressure and dip stick
D- bull’s –eye, weight,litmus test and frost line
240. Liquid’’slugging’’is caused by:
A- liquid in the compressor clearence space
B- excessive liquid refrigerant in the receiver
C- the precence of the liquid in the condenser causing excessive noise
D- the pounding of the liquid refrigerant in the suction line at the point
of restriction
241. All refrigerator compressor valve opened and closed by:
A- a cam shaft C- springs
C- pressure diferential D- B or C
242. Hidden heat in refrigeration work is feferred to as:
A- sensible heat C- latent heat
B- heat intensity D- A or C
243. Bull’’s-eye in full liquid line will appear
A- cloudy B- clear C- bubbly D- light brown color
244. A compressor capacity reduction devise reduces compressor kapasity;
A- by reducing the compressor speed
B- bypassing hot gas
C- as the refrigerant load dictates
D- by reducing compressor horsepower proportionately
1. ------------- is the first signal of lube- oil trouble.
A) Lube oil gravity tank low level alarm goes off
B) Low lube oil sump level
C) Low outlet temperature from lube oil coolers
D) No flow throught bull’s eye from gravity tank observed
E) A and B
2. -------------- is not one of the advantages of the open cooling system.
A) Being the simplest system
B) No requirement of heat exchange
C) Obligation of keeping engine cool
D) The requirement of only one water circulating pump
E) The requirement of 2 water circulating pumps
3. The TEV (thermostatic expansion valve) is located between:
A) The receiver and the king valve
B) The king valve and solenoid
C) Both A and B
D) The solenoid valve and evaporator
E) The charging valve and solenoid
4. What is the high pressure side of the refrigeration system?
A) Compressor to condenser
B) Evaporator to compressor
C) Expansion valve to evaporator
D) Compressor to expansion valve
E) Evaporator
5. The reciprocating motion of a connecting rod is transformed into a rotary motion by the:
A) Crankshaft
B) Crankwebs
C) Crank cheeks
D) Crankpine
E) Piston
6. What is the advantage of using a hydraulic starting system for an emergency diesel?
A) The system is inexpensive
B) High pressure lines are not required
C) It is compact
D) Faster cranking speeds are obtained
E) None of the above
7. What would cause white smoke after you just started the diesel?
A) Too week battery power
B) Water in the fuel
C) Water in the gas
D) Water in the oil
E) Salt water in cooling water
8. The turbocharger of an auxiliary diesel engine is most effected by:
A) Air inlet manifold pressure
B) Engine speed
C) Exhaust temperature
D) Engine load
E) None of the above
9. The coils in the evaporator are attached to the header by:
A) Pipe nipples
B) Union type fittings
C) Welding
D) Bolted flanges
E) Both C and D
10. The system used for breaking scale from the evaporator coil while the evaporator is in operation is called:
A) Recirculating
B) Blowing down
C) Cracking off
D) Dumping
E) None of above
11. Cylinder liner are generally used on diesel engines because:
A) Liners may be easily replaced after the cylinder walls show wear
B) Liners provide a more efficient cooling system
C) Rubbing speeds are reduced through the use of liners
D) Liners provide a better lubricating surface
E) None of the above
12. An over speeding diesel engine could best be stopped by:
A) Disconnecting the battery cables from the stating motor
B) Blocking the air intake and securing the fuel supply
C) A raining the hydraulic fluid from the governor sump
D) Blocking the flow of cooling air to the radiator
E) Both C and D
13. The valve which is always partially open when the evaporator is in operation is the:
A) Vapor valve
B) Continuous blowdown valve
C) Bottom blowdown valve
D) Surface blowdown valve
E) Bottom blowup valve
14. The dehydrator on a refrigeration plant is used to:
A) Add moisture to the system
B) Remove moisture from the system
C) Remove air from the system
D) Remove oil from the system
E) Both C and D
15. As freon leaves the expansion valve:
A) Pressure decreases – volume increases
B) Volume decreases – pressure increases
C) Volume increases – pressure increases
D) Pressure increases – volume decreases
E) None of the above
16. ---------------is the principal hazard to staff when a diesel nozzle tester is in use is
A) Electrical shock
B) Toxic fumes
C) Explosion
D) Blood poisoning
E) Loosing consciousness
17. The oil level in the compressor should be checked:
A) While the compressor is in operation
B) Just before starting the compressor
C) After a long period of operation
D) For both B and C
E) None of the above
18. What type of gauge reads pressure and vacuum?
A) Duplex
B) Simplex
C) Both B and C
D) Compound
E) Bourdon tube
19. Minor freon leaks can be detected by the use of a device called:
A) A freon visible leak detector
B) A freon audible leak detector
C) The blue oven flame detector
D) Halide torch
E) None of the above
20. Most gauges in the fire room are:
A) Manometers
B) Thermocouples
C) Dual purpose
D) Thermometers
E) Bourdon tube – type
21. If one fuel oil strainer of a duplex unit becomes clogged while your vessel is steaming at sea, you should first:
A) Clean the dirty strainer as quickly as possible
B) Change the strainer over to the clean side
C) Stop the fuel oil service pump
D) Open the strainer bypass valve
E) Stop the engine
22. The main characteristics of a diesel engine is:
A) internal combustion engine; the fuel is burned external of the cylinders
B) producing high power of energy
C) either 2 or 4 stroke, fuel is burned inside the cylinders
D) economical in compare with the steam engines, but hard maintenance
E) fixed sequence of events within its unique type
23. The sequence of events in a cycle within 4 stroke diesel engine is:
A) The piston is forced down at BDC (Bottom Dead Center) exhaust valve opens
B) The piston is at the top of its stroke, TDC (Top Dead Center), inlet valve opens, fresh air is drawn
C) Pressure is high in the gases
D) Fuel is injected as the piston reaches TDC, to start the combustion
E) Inlet valve opens, fresh air is drawn as the piston moves down
24. At the bottom of the stroke BDC inlet valve closes and the air in cylinder is compressed as the piston rises
A) 2-5-6-4-3-1
B) 2-5-6-4-1-3
C) 2-6-5-4-3-1
D) 5-2-4-6-3-1
E) 5-2-6-4-1-3
25. Pre- ignition can be caused by ------------------------- in an operating diesel engine.
A) Excessively late fuel injection
B) Oil in the air charge
C) Water in the fuel
D) Injection continuing after the fuel charge is ignited
E) None above
26. The upper section of a piston is called the:
A) Land
B) Skirt
C) Crown
D) Plate
E) Disk
27. What types of lubricating oil systems are used on diesel engines?
A) Forced feed and gravity
B) Forced feed and splash
C) Both A and B
D) Gravity and wick
E) Wet sump and dry sump
28. Before starting an auxiliary diesel engine, you should:
A) Change fuel oil strainers
B) Clean the air filter
C) Check the crankcase oil level
D) Vent the cooling system
E) Clean flywheel
29. The suction control switch on the compressor is a -------------------------
A) Thermal element
B) Thermostat
C) Pressure element
D) None above
E) All of above
30. By definition a separator: I. removes solids from the lube oil; II. re¬moves water from the lube oil.
A) I
B) II
C) I and II
D) Neither I nor II
E) Any of above
31. As Freon leaves the expansion valve...................................
A) Pressure increases – volume increases
B) Pressure decreases – volume increases
C) Pressure decreases – volume decreases
D) Pressure increases – volume decreases
E) Pressure increases – no change in the volume
32. A ball bearing will overheated if:
Completely full of grease
Half full of grease
In use for a long time
Operated at high speed
Operated at medium speed
33. Which of the following types of valves is used in the bilge manifold?
A) Swing check
B) Nonreturn
C) Angle
D) Globe
E) Butterfly
34. Before ballasting by gravity ----------------------------
A) Pump in ballast for about 10 minutes to wash out bottom lines
B) Start pump before opening sea valves
C) Make sure all proper valves are open
D) All of above
E) A and B
35. The process of supplying the intake of a diesel engine with air at a pressure greater than atmospheric is called:
A) Engine displacement
B) Scavenging
C) Air injection
D) Supercharging
E) Intercooling
36. In the simple mechanical governor, the:
A) Flyweight centrifugal force is balanced by spring pressure
B) Centrifugal force rotates the ball head
C) Flyweight centrifugal force is balanced by hydraulic pres sure
D) Speeder spring actuates the fuel control rod
E) Hydraulic force rotates the ball head
37. One horsepower equals ......
A) 1000 watts
B) 746 watts
C) 100 watts
D) 940 watts
E) 786 watts
38. Emergency generators are placed --------------------
A) Near the machinery space
B) Above the bulkhead or freeboard deck whichever the higher
C) Midships near the engine room casing
D) Above the deep load line
E) None above
39. ------------ is the first to do when securing an AC generator.
A) Tripping the generator circuit breaker
B) Switching the voltage regulator to manual
C) Decreasing the field excitation to minumum
D) Reducing the load on the unit
E) Increasing the load on the unit
40. In accordance with the international requirements, the bilge purifier will seperate oily water within the density of ....
A) < 15 particular per million
B) < 15 particular post million
C) < 15 particular per meter
D) ≤ 15 particular per meter
E) < 15 particular per billion
41. The requirement for portable fire equipment is ----------------------------
A) Annual check
B) Keeping in easily accessible places
C) Hose connections and keeping hoses in good condition
D) All above
E) Before the end of consuming period
42. With a reciprocating pump, failure to deliver liquid may be caused by ------------------
A) Pump not being primed
B) Discharge head too high
C) Liquid plunger packing worn
D) Any of the above
E) Only A and B
43. Which of the following isn’t a component of a water tube boiler?
A) burner
B) header
C) downcomer
D) steam drum
E) booster pump
44. The heat which is used to change a liquid to a gas or vapor is called latent heat of.................
A) Absorption
B) Fusion
C) Liquid
D) Evaporization
E) Fission
45. Prior to port arrival, a diesel alternator ...................... , turbo alternator ..................., and all the full away procedure should be done ..........................
A) Will have to be started/will be shut down/in reverse order
B) Doesnot have to be started/will have to be shut down/in reverse order
C) Will have to be started/will have to be started/in right order
D) Will have to be shut down/will have to be started/in reverse order
E) Doesn’t have to be shut down/will have to be shut down/in right order
46. When the separated oil is burnt by an....................., the application is recorded in Oil Record Book.
A) oily water separator
B) ejector
C) incinerator
D) chlorinator
E) aeration chamber
47. Fire detecting and extinguishing equipment is required on all ...............
A) Cargo vessels
B) Passenger vessels on international voyage
C) Vessels over 150 feet in length
D) Vessels over 450 feet in length
E) Cruise boats
48. Any automatic sprinkler, fire detection and fire alarm system shall be capable of immediate operation at all times and no action by the crew shall be necessary to set it in operation. Each section of sprinklers shall include means for giving a visual and audible alarm automatically whenever any sprinkler comes into operation. Sprinklers shall be grouped into separate sections, each of which shall contain not more than 200 sprinklers. Each section shall be capable of being isolated by one stop valve only. A gauge indicating the pressure in the system shall be provided at each section stop valve and a central station. The sprinklers shall be resistant to corrosion by marine atmosphere. In accommodation and service spaces the sprinklers shall come into operation within the temperature range from 68°C to 79°C. A list or plan shall be displayed at each unit and suitable instructions for testing and maintenance shall be available. Sprinklers shall be placed in an overhead position to maintain an average application rate of not less than 5 l/m²/min over the area covered by the sprinklers.
According to the passage, it isn’t true that;
A) The sprinklers can be affected by marine atmosphere.
B) They will be in an overhead position to maintain the average application.
C) The pressure in the system is displayed by a pressure gauge
D) Sprinkler system is used either fixed or mobile on board.
E) The system shall be divided into sections.
49. The process of supplying the intake of a diesel engine with air at a pressure greater than atmospheric is called:
A) Engine displacement
B) Scavenging
C) Air injection
D) Supercharging
E) Intercooling
50. In the simple mechanical governor, the:
A) Flyweight centrifugal force is balanced by spring pressure
B) Centrifugal force rotates the ball head
C) Flyweight centrifugal force is balanced by hydraulic pres sure
D) Speeder spring actuates the fuel control rod
E) Hydraulic force rotates the ball head
51. In case of burning of radio equipments on the bridge the extinguishers should be the same as the ones to be used in ........................... fires, keeping in mind that the fire will turn out tobe a ....................... fire when starting firefighting takes long.
A) Class E/Class A
B) Class E/Class B
C) Class B/Class A
D) Class C/Class A
E) Class C/Class E
52. “The quantity of oil in separated water is controlled by a control unit.”
What sentence below has the same meaning?
A) Control unit controls the oil quantity and separate it.
B) The quantity of oil is separated and controlled by control unit
C) The oil quantity in water is separated by control unit
D) Control unit controls the oil quantity in separated water.
E) Separated water in oil is controlled by control unit.
53. Blue smoke coming from the diesel exhaust would indicate:
A) Excessive fuel consumption/unburned fuel
B) Burning of lube oil due to possible blow-by
C) Lean fuel/air mixture, too much air
D) Insufficient amount of fuel consumption
E) None of the above
54. The air supplied to the cylinders by a turbocharger is often reduced in volume by a/an:
A) Air compressor
B) Diffuser
C) Filter
D) Venturi
E) Aftercooler
55. Another name for the liquid valve is:
A) Master valve
B) King valve
C) Freon valve
D) Shut off valve
E) None of above
56. The turbocharger of an auxiliary diesel engine is most effected by:
A) Air inlet manifold pressure
B) Engine speed
C) Exhaust temperature
D) Engine load
E) None of the above
57. The coils in the evaporator are attached to the header by:
A) Pipe nipples
B) Union type fittings
C) Welding
D) Bolted flanges
E) Both C and D
58. An electric heater built into the cylinder water jacket would be used to:
A) Raise lube oil viscosity for easier starting in cold weather
B) Increase air inlet temperature
C) Increase compression ratio
D) Increase jacketwater temperature for easier starting in cold weather
E) Heating compressed air
59. Most gauges in the fire room are:
A) Manometers
B) Thermocouples
C) Dual purpose
D) Thermometers
E) Bourdon tube – type
60. How often should the emergency diesel be run under load?
A) Once a year
B) Once a month
C) Once a week
D) At survey time only
E) At drydock
61. Which one is not identical with the characteristics of the construction of a-2-stroke diesel engines?
A) Instead of valve holes, ports are installed
B) A cycle is completed in 2 strokes of the piston
C) Produce high power in compare with 4 stroke engines
D) The maintenance is simple
E) A cycle is completed in 2 revolution of the crackcase
62. Which of the following is not one of the parts of D/G overhaul?
A) Valve rotator
B) Valve spindle
C) Intake valve
D) Valve seat
E) Starting valve
63. Scavenging means --------------------------- on an internal combustion engines.
B) The removal of exhaust gases by blowing in fresh air
The filling of the engine cylinder with a supply or change of fresh air
The formation of exhaust gases within the cylinder
The removal of exhaust gases
Any above
64. The upper section of a piston is called the:
A) Land
B) Skirt
C) Crown
D) Plate
E) Disk
65. What types of lubricating oil systems are used on diesel engines?
A) Forced feed and gravity
B) Forced feed and splash
C) Both A and B
D) Gravity and wick
E) Wet sump and dry sump
66. Having an unstarting compressor must make you think the possibiliy of .................
A) No charge of liquid in the system
B) Closed solenoid valves
C) A and B
D) None above
E) Having sufficient amount of air
67. The purpose of an evaporator is to ......
A) Transmit the latent heat of fusion
B) Transmit the latent heat of evaporation
C) Absorb the latent heat of evaporation
D) Absorb the latent heat of fusion
E) Any above
68. ................is a process , in which the temperature of a space on whatever takes place in, is reduced below that of their surroundings.
A) Refrigeration
B) Air conditioning
C) Ventilation
D) Heating
E) Freezing
69. An overheated bearing in the main propulsion unit is indicated by:
A) Bubbles in the sight glass
B) Sludge in the strainers
C) A high oil level in the sump
D) Low temperature of the lube oil leaving the bearing
E) High temperature of the lube oil leaving the bearing
70. The liner which has no direct contact with the cooling water is what kind of a liner?
A) Wet
B) Dry
C) Integral
D) None of the above
E) Cooled with lubrication oil
71. The function of the exhaust system for a turbocharged diesel engine is to --------------
A) Power the aftercoolers
B) Power the turbocharger
C) Reduce the cylinder scavenge effect
D) Cool the turbocharger
E) Any above
72. A fire sprinkling system must be fitted......................
A) On all vessels over 5.000. GT
B) In conjunction with the CO2 system (x)
C) With a pressure tank of fresh water to the supply system pending the starting of the pump
D) None of the above
E) A and C
73. Under normal operational conditrons, the rudder is hydraullically locked unless...........
A) The manual trick wheel is engaged for steering
B) The pupm is off stroke
C) A normal rudder order is given by the control system
D) An electric power failure occurs at the steering gear
E) A and B
74. Static electricity is most often produced by ----------------------
A) Pressure
B) Heat
C) Magnetism
D) Friction
E) Motion
75. When vacuum is lost on a turbo generator the trip is actuated by -------------------
A) Sentinel valve
B) Back pressure
C) Slugs of water
D) Overspeed trip
E) A and B
76. Emergency generators can be stopped via -----------------
A) Ovelvoltage trip
B) Overspeed trip
C) Manual trip
D) Undervoltage
E) Any above
77. Supposing a fire caused by short electric circuit within the equipments is categorized as a ............................ fire and will be extinguished vıa .....................................
A) Class A/foam
B) Class C/chemical powder
C) Class C/CO2
D) Class B/foam
E) Class A/chemical powder
78. 1 In accordance with the international requirements, the bilge purifier will seperate oily water within the density of ……..
A) < 15 particular per million
B) < 15 particular post million
C) < 15 particular per meter
D) ≤ 15 particular per meter
E) < 15 particular per billion
79. -------is used as a fire extinguisher in case of fires resulted from electrical equipment.
A) Soda acid
B) CO 2
C) Sand
D) Foam
E) C and D
80. The removal of contaminating impurities from lubricating oil will ......................
A) Increase engine wear
B) Decrease engine wear
C) Increase possible breakdowns
D) Decrease possible breakdowns
E) B and D
81. Cut out system on the aux boiler operates ................................
A) Low level alarm
B) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
82. ---------------is the cause of burned exhaust valves
A) Overloaded cylinder
B) Poor combustion
C) Distortion and faulty reseating maintenance
D) Any above
E) A and B
83. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
A) Pumping only if discharge is led to a shore tank or barge
B) Pumping only during the hours of darkness
C) Pumping only on the outgoing tide
D) Pumping only as much as is necessary
E) Pumping only the day hours
84. Sediment collects in a tubular purifier:
A) On top cover
B) In drain line
C) On sides of bowl
D) On the discs
E) None of above
85. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
A) Buffer springs
B) Follow up mechanism
C) Relief valves
D) Relieving gear
E) Steering pumps
86. Blue smoke coming from the diesel exhaust would indicate:
F) Excessive fuel consumption/unburned fuel
G) Burning of lube oil due to possible blow-by
H) Lean fuel/air mixture, too much air
İ) Insufficient amount of fuel consumption
J) None of the above
87. The valve which is always partially open when the evaporator is in operation is the:
A) Vapor valve
B) Continuous blowdown valve
C) Bottom blowdown valve
D) Surface blowdown valve
E) Fresh water valve
88. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
89. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
90. What harmful consequence can result from sludge in the lube oil system of a trunk piston diesel engine?
A) Clogged oil pump suction screens
B) Increased oil temperature
C) Stuck piston rings
D) Any of the above
E) None of the above
91. Trunk type diesel engine pistons are most effectively cooled when heat is:
A) Radiated through the engine block
B) Mixed with lubrication oil
C) Conducted through the piston crown
D) Transferred to escaping exhaust gases
E) Transferred to water cooled cylinder walls
92. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
A) A loss of thrust
B) Erosion of the blade surface
C) Vibrations in the afterbody of the ship
D) Noise
E) All above
93. When the oil in the seperator is decreasing, which place cannot be leaking?
A) Lower bearing casing
B) Drum shaft
C) Wormgear shaft bearing hosing
D) Middle ball bearing casing
E) The o-ring at shock water entrance to seperator into shockwater
94. -------------should be regarded as a special attention after installing a new hydraulic pump.
The relief filters should be readjusted
B) The filters and strainers should be checked frequently
System pressures should be readjusted
The fluid should be drained and renewed
All above
95. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
A) Rough log
B) Engine room log
C) Oil record book
D) Smooth log
E) A and B
96. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
A) Chief Engineer
B) 2nd Engineer
C) Boatswain
D) 2nd officer
E) Any above organization
97. A spring bearing on the line shaft is lubricated by :
A) The lube oil gravity tank
B) Water leak off from the stern tube
C) An oil ring and scraper
D) The main lube oil pump
E) Any above
98. An electric heater built into the cylinder water jacket would be used to:
F) Raise lube oil viscosity for easier starting in cold weather
G) Increase air inlet temperature
H) Increase compression ratio
İ) Increase jacketwater temperature for easier starting in cold weather
J) Heating compressed air
99. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
A) Purge the condenser
B) Remove refrigerant
C) Adjust the thermostatic expansion valve
D) Increase the compressor speed
E) Add refrigerant
100. This gauge measures both inlet and outlet pressures of a strainer:
A) A compound gauge
B) A duplex gauge
C) A biogauge
D) A pressure / vacuum gauge
E) None of the above
101. In a 4 stroke engine 2 revolution of the crank is completed within.the angle of --------
A) 7200
B) 3600
C) 1800
D) 900
E) 450
102. What will happen to a small diesel engine that is equipped with an “auto type” thermostat if the bellows develop a hole in it?
A) The engine will overheat
B) The engine will remain cold
C) The engine will remain not start
D) The cooling water will “by pass” the engine
E) None of the above
103. When does a two stroke cycle diesel engine produce a power stroke in each cylinder?
A) Once in every 2 revolutions of the crankshaft
B) Once for every 4 stroke of the piston
C) Once for every 2 stroke of the piston
D) Directly after the exhaust stroke
E) None of the above
104. ..................are the common parts within the 2 and 4 stroke diesel engines.
A) Piston, valves, cylinder, fuel injector
B) Crankshaft, crosshead, cylinder
C) Turbocharger, piston, gudgeonpin, cylinder
D) Crankshaft, connecting rod, pistons
E) Cylinder; connecting rod, pistons
105. Blue smoke coming from the diesel exhaust would indicate:
A) Excessive fuel consumption / unburned fuel
B) Burning of lube oil due to possible blow by
C) Lean fuel / air mixture, too much air
D) Less amount of fuel consumption
E) None of the above
106. All diesel lubricating system must:
A) Have a forced feed mechanical lubricator
B) Prevent oil fog in the crankcase to avoid crankcase explosion
C) Provide oil for cooling the piston and cylinder wall
D) Provide a film of oil between the piston and cylinder wall
E) None of the above
107. All of the following are used for low temperature starting, except:
A) Ether
B) Jacket water heaters
C) Both A and B
D) Air intake heaters
E) Cylinder compression ratio reduced
108. Which of the following is highly advised to be used for washing turbo charger blower by the manifacturers?
A) Hotwater
ACC9+Hot water
Filter clean+hotwater
Carbon remover+hot water
Descalex liquid+ hot water
109. If the flow of water from a centrifugal pump is stopped by closing the discharge valve with the pump running:
A) The relief valve will open
B) The water pressure will stabilize at shut off head
C) The water pressure will tend to rise continuously
D) The driver will be over loaded
E) The water temperature will tend to decrease continuously
110. Which factor below is not the cause of vibration and noise in turbines?
A) Unbalance
B) Dıstortion of casing
C) Loose couplings
D) Tight couplings
E) Any above
111. The drains from both effects in a low pressure evaporator have their pressures equalized in the:
A) Equalizer tank
B) Drain tank
C) Flash chamber
D) Air ejector condense
E) Fuel oil tank
112. The second effect on a two pass evaporator receives its steam from:
A) De-superheated steam
B) Vapors from first effect
C) Auxiliary back pressure
D) Auxiliary forward pressure
E) None of the above
113. When purging a refrigeration system, the compressor is ………………
A) Running
B) Running with the bypass open
C) Shut down
D) Running with the bypass closed
E) Running steadily
114. All refrigerator compressor valves are opened and closed via ………….
A) Springs
B) Camshaft
C) Pressure differential
D) A or C
E) None above
115. Prior to port arrival, a diesel alternator ...................... , turbo alternator ..................., and all the full away procedure should be done ..........................
A) Will have to be started/will be shut down/in reverse order
B) Doesnot have to be started/will have to be shut down/in reverse order
C) Will have to be started/will have to be started/in right order
D) Will have to be shut down/will have to be started/in reverse order
E) Doesn’t have to be shut down/will have to be shut down/in right order
116. When oil is heated, it becomes ......
A) Less viscous
B) Emulsified
C) More viscous
D) Vitrified
E) Not necessarly vitrified
117. Low head pressure can be caused by ........
A) Too much condensing water
A) Too cold condensing water
B) Leaky discharge valves
C) Insufficient change of refrigerant
D) Any of the above
118. --------is hardly the cause of a smoky diesel engine exhaust.
A) Overload
B) Malfunctioned injector
C) Choked exhaust pipe
D) Inappropriate amount of fuel
E) Appropriate amount of fuel
119. Flashlights used aboard tankers must be........
A) Waterproof
B) Of the three cell type
C) Approved by the Board of fire underwriters
D) All above
E) A and C
120. The usual cause of crankcase explosions in diesel engines is not -----------------------
A) Heating lubricating oil
B) Overheating lubricating oil
C) Poor condition of the cylinder
D) Crank shaft bearing failures maintenance
E) Any above
121. The low pressure side of a refrigeration system is from the:
C) Expansion valve to compressor
D) Compressor to expansion valve
E) Expansion valve to the evaporator
F) Condenser to the expansion valve
G) None of the above
122. Pre combustion chambers in a diesel engine:
A) Require that each cylinder use two spray nozzles
B) Require the use of flat crowned pistons to obtain turbulence
C) Permit the use of a wide range of fuel in that engine
D) Contain all of the air charge at the end of the compression stroke
E) Require that each cylinder use more than four spray nozzles
123. Refrigerant leakage from the compressor crankcase is prevented by ----------------
A) Using skirt type pistons
B) Using shaftseals
C) Using lantern rings
D) Maintaining a vacuum in the crankcase
E) Any above
124. The system used for breaking scale from the evaporator coil while the evaporator is in operation is called:
A) Recirculating
B) Blowing down
C) Cracking off
D) Dumping
E) None of above
125. As freon leaves the expansion valve:
A) Pressure decreases – volume increases
B) Volume decreases – pressure increases
C) Volume increases – pressure increases
D) Pressure increases – volume decreases
E) None of the above
126. In a diesel engine closed cooling system, the flow of fresh water through the fresh water and lube oil coolers is controlled by the:
A) Speed of the engine
B) Speed of the pump impeller
C) Automatic temperature regulator
D) Suction pressure regulator
E) Governor
127. A “pneumercator” measures:
A) Oil pressure
B) Air level
C) Liquid level
D) Air pressure
E) Air temperature
128. What type of gauge reads pressure and vacuum?
A) Duplex
B) Simplex
C) Both B and C
D) Compound
E) Bourdon tube
129. Minor freon leaks can be detected by the use of a device called:
A) A freon visible leak detector
B) A freon audible leak detector
C) The blue oven flame detector
D) Halide torch
E) None of the above
130. The lubricant is expected to have the qualities of ....................................
A) Preventing metal-to metal contact
B) Causing metal to metal contact
C) Decrease friction
D) Decrease friction wear
E) All expect B
131. If one cylinder was getting more fuel than others the effect will be ---------------------
A) That cylinder’s being overloaded
B) The exhaust valve’s being overheated
C) Average compression
D) Incomplete combustion
E) Complete combustion
132. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
F) Pumping only if discharge is led to a shore tank or barge
G) Pumping only during the hours of darkness
H) Pumping only on the outgoing tide
İ) Pumping only as much as is necessary
J) Pumping only the day hours
133. A propulsion diesel engine is normally shut down by ----------------------------
A) Shutting off the air supply
B) Overspeeding the engine
C) Securing the fuel supply
D) Securing the ignition system
E) All above
134. Sediment collects in a tubular purifier:
F) On top cover
G) In drain line
H) On sides of bowl
İ) On the discs
J) None of above
135. “Water hammer” is caused by:
A) Hitting water pipe with hammer
B) Too much water in pipe line system
C) Water in steam lines
D) Steam in water lines
E) Few amount of water in pipe line system
136. The valve which is always partially open when the evaporator is in operation is the:
F) Vapor valve
G) Continuous blowdown valve
H) Bottom blowdown valve
İ) Surface blowdown valve
J) Fresh water valve
137. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
H) Heat resistant
Hard finished
Half threaded
Corrosion resistant
Fire proof
138. The rotating part of a micrometer is the:
A) Anvil
B) Barrel
C) Frame
D) Thimble
E) Cover
139. An advantage of aluminum pistons compared to cast iron pistons is:
A) Greater high temperature strength
B) Greater weight per cubic meter
C) Increased resistance to wear
D) Low temperature strength
E) Better heat conductivity
140. Trunk type diesel engine pistons are most effectively cooled when heat is:
F) Radiated through the engine block
G) Mixed with lubrication oil
H) Conducted through the piston crown
İ) Transferred to escaping exhaust gases
J) Transferred to water cooled cylinder walls
141. Insufficient refrigerant in a refrigeration plant on board a ship may result in:
A) High discharge pressure
B) Frosting of the crankcase
C) High temperature of the overboard water
D) Low suction pressure
E) Low temperature of the sea water
142. .................. should be considered as a hazard on the propeller and a thorough examination and repair will be carried out when the vessel is in dry dock.
A) Bent blades
B) Signs of cracks on the blade edge
C) Deep pits and holes
D) Edge cracks
E) All above
143. Considering the fuel, ignition quality is determined by ....................................
A) Cetane number
B) Diesel index
C) Calculated cetane index
D) Flash point
E) All except D
144. When operating at high or low speed in the use of nozzles in a turbine, attention and precaution must be taken that ............................
The nozzles in use should be wide open
Operation with a few nozzles as it’s economical
The nozzles not in use must be tightly closed
B) All above
C) Only A and B
145. ---------------------protects the pump shafts from erosion, corrosion and wear
A) Wearing rings
B) Renewable sleeves
C) A hardened metal coating
D) Internally flooded lantern rings
E) Lantern rings
146. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
F) Chief Engineer
G) 2nd Engineer
H) Boatswain
İ) 2nd officer
J) Any above organization
147. Performance of a turbocharged engine can be improved by:
A) Decreasing valve over lap
B) Preheating
C) Aftercooling intake air
D) Preheating light fuels
E) Heating intake air
148. When maneuvering, you discover heavy smoke coming from the turbocharger casing. You should:
A) Check the air filter for dirt
B) Check for an exhaust leak
C) Check the cooling water temperature
D) Notify the bridge and ask to shut the engine down
E) Check fuel oil consumption
149. A device which will function to bring an engine to a full stop in order to protect it from damage due to excessively high speed is known as a/an:
A) Torque limiter
B) Overspeed trip
C) Overspeed governor
D) Load limit governor
E) Any of above
150. The removal of contaminating impurities from lubricating oil will ......................
F) Increase engine wear
G) Decrease engine wear
H) Increase possible breakdowns
İ) Decrease possible breakdowns
J) B and D
151. Cut out system on the aux boiler operates ................................
A) Low level alarm
B) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
152. ---------------is the cause of burned exhaust valves
F) Overloaded cylinder
G) Poor combustion
H) Distortion and faulty reseating maintenance
İ) Any above
J) A and B
153. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
K) Pumping only if discharge is led to a shore tank or barge
L) Pumping only during the hours of darkness
M) Pumping only on the outgoing tide
N) Pumping only as much as is necessary
O) Pumping only the day hours
154. Sediment collects in a tubular purifier:
K) On top cover
L) In drain line
M) On sides of bowl
N) On the discs
O) None of above
155. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
F) Buffer springs
G) Follow up mechanism
H) Relief valves
İ) Relieving gear
J) Steering pumps
156. Blue smoke coming from the diesel exhaust would indicate:
K) Excessive fuel consumption/unburned fuel
L) Burning of lube oil due to possible blow-by
M) Lean fuel/air mixture, too much air
N) Insufficient amount of fuel consumption
O) None of the above
157. The valve which is always partially open when the evaporator is in operation is the:
K) Vapor valve
L) Continuous blowdown valve
M) Bottom blowdown valve
N) Surface blowdown valve
O) Fresh water valve
158. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
İ) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
159. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
160. What harmful consequence can result from sludge in the lube oil system of a trunk piston diesel engine?
F) Clogged oil pump suction screens
G) Increased oil temperature
H) Stuck piston rings
İ) Any of the above
J) None of the above
161. Trunk type diesel engine pistons are most effectively cooled when heat is:
K) Radiated through the engine block
L) Mixed with lubrication oil
M) Conducted through the piston crown
N) Transferred to escaping exhaust gases
O) Transferred to water cooled cylinder walls
162. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
F) A loss of thrust
G) Erosion of the blade surface
H) Vibrations in the afterbody of the ship
İ) Noise
J) All above
163. When the oil in the seperator is decreasing, which place cannot be leaking?
F) Lower bearing casing
G) Drum shaft
H) Wormgear shaft bearing hosing
İ) Middle ball bearing casing
J) The o-ring at shock water entrance to seperator into shockwater
164. -------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
165. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
F) Rough log
G) Engine room log
H) Oil record book
İ) Smooth log
J) A and B
166. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
K) Chief Engineer
L) 2nd Engineer
M) Boatswain
N) 2nd officer
O) Any above organization
167. A spring bearing on the line shaft is lubricated by :
A) The lube oil gravity tank
B) Water leak off from the stern tube
C) An oil ring and scraper
D) The main lube oil pump
E) Any above
168. An electric heater built into the cylinder water jacket would be used to:
K) Raise lube oil viscosity for easier starting in cold weather
L) Increase air inlet temperature
M) Increase compression ratio
N) Increase jacketwater temperature for easier starting in cold weather
O) Heating compressed air
169. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
F) Purge the condenser
G) Remove refrigerant
H) Adjust the thermostatic expansion valve
İ) Increase the compressor speed
J) Add refrigerant
170. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
171. When distilling salt water the cooling-water discharge from the distiller is fed back to the evaporator as feedwater:
A) To cut down on the amount of cooling water needed
B) To prevent an excess amount of cooling water from being discharged to the bilges
C) To supply hot water to the evaporator for more economical operation
D) To supply sufficient amount of sea water
E) None of the above
172. The rotating part of a micrometer is the:
F) Anvil
G) Barrel
H) Frame
İ) Thimble
J) Cover
173. An advantage of aluminum pistons compared to cast iron pistons is:
F) Greater high temperature strength
G) Greater weight per cubic meter
H) Increased resistance to wear
İ) Low temperature strength
J) Better heat conductivity
174. Trunk type diesel engine pistons are most effectively cooled when heat is:
P) Radiated through the engine block
Q) Mixed with lubrication oil
R) Conducted through the piston crown
S) Transferred to escaping exhaust gases
T) Transferred to water cooled cylinder walls
175. Insufficient refrigerant in a refrigeration plant on board a ship may result in:
F) High discharge pressure
G) Frosting of the crankcase
H) High temperature of the overboard water
İ) Low suction pressure
J) Low temperature of the sea water
176. The removal of contaminating impurities from lubricating oil will ......................
K) Increase engine wear
L) Decrease engine wear
M) Increase possible breakdowns
N) Decrease possible breakdowns
O) B and D
177. The lubricant is expected to have the qualities of ....................................
F) Preventing metal-to metal contact
G) Causing metal to metal contact
H) Decrease friction
İ) Decrease friction wear
J) All expect B
178. If one cylinder was getting more fuel than others the effect will be ---------------------
F) That cylinder’s being overloaded
G) The exhaust valve’s being overheated
H) Average compression
İ) Incomplete combustion
J) Complete combustion
179. ----------------------- should be followed as a procedure, if it is necessary to pump bilges while a vessel is in port
P) Pumping only if discharge is led to a shore tank or barge
Q) Pumping only during the hours of darkness
R) Pumping only on the outgoing tide
S) Pumping only as much as is necessary
T) Pumping only the day hours
180. A propulsion diesel engine is normally shut down by ----------------------------
F) Shutting off the air supply
G) Overspeeding the engine
H) Securing the fuel supply
İ) Securing the ignition system
J) All above
181. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
K) Buffer springs
L) Follow up mechanism
M) Relief valves
N) Relieving gear
O) Steering pumps
182. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
P) Chief Engineer
Q) 2nd Engineer
R) Boatswain
S) 2nd officer
T) Any above organization
183. An electric heater built into the cylinder water jacket would be used to:
P) Raise lube oil viscosity for easier starting in cold weather
Q) Increase air inlet temperature
R) Increase compression ratio
S) Increase jacketwater temperature for easier starting in cold weather
T) Heating compressed air
184. Which of the following actions should you take to correct a low condensing pressure in a refrigeration system?
K) Purge the condenser
L) Remove refrigerant
M) Adjust the thermostatic expansion valve
N) Increase the compressor speed
O) Add refrigerant
185. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
K) A loss of thrust
L) Erosion of the blade surface
M) Vibrations in the afterbody of the ship
N) Noise
O) All above
186. Considering the fuel, ignition quality is determined by ....................................
F) Cetane number
G) Diesel index
H) Calculated cetane index
İ) Flash point
J) All except D
187. When the oil in the seperator is decreasing, which place cannot be leaking?
K) Lower bearing casing
L) Drum shaft
M) Wormgear shaft bearing hosing
N) Middle ball bearing casing
O) The o-ring at shock water entrance to seperator into shockwater
188. -------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
189. ---------------------protects the pump shafts from erosion, corrosion and wear
F) Wearing rings
G) Renewable sleeves
H) A hardened metal coating
İ) Internally flooded lantern rings
J) Lantern rings
190. The removal of contaminating impurities from lubricating oil will ......................
P) Increase engine wear
Q) Decrease engine wear
R) Increase possible breakdowns
S) Decrease possible breakdowns
T) B and D
191. Cut out system on the aux boiler operates ................................
A) Low level alarm
A) Low low level alarm
C) High level alarm
D) High pressure alarm
E) Low pressure alarm
192. ---------------is the cause of burned exhaust valves
K) Overloaded cylinder
L) Poor combustion
M) Distortion and faulty reseating maintenance
N) Any above
O) A and B
193. When a cargo hose joint or coupling starts to leak badly the attempt you should do is to...
A) Reduce pumping pressure and wrag leak securely
B) Shut down transfer and make repairs
C) Soak spill with sawdust and reduce pumping pressure
D) Wash deck immediately and close tank tops
E) Carry on transfer
194. Water in the lube oil system may be detected by: I. sounding lube oil tanks with water sensitive paste; II. observing the purifier discharge.
A) I
B) II
C) I and II
D) Neither I nor II
E) None of above
195. Electrohydraulic steering units are protected from pounding forces (rudder shock) by:
P) Buffer springs
Q) Follow up mechanism
R) Relief valves
S) Relieving gear
T) Steering pumps
196. Blue smoke coming from the diesel exhaust would indicate:
P) Excessive fuel consumption/unburned fuel
Q) Burning of lube oil due to possible blow-by
R) Lean fuel/air mixture, too much air
S) Insufficient amount of fuel consumption
T) None of the above
197. The valve which is always partially open when the evaporator is in operation is the:
P) Vapor valve
Q) Continuous blowdown valve
R) Bottom blowdown valve
S) Surface blowdown valve
T) Fresh water valve
198. Studs and nuts intended for use in main steam line flanges and fittings are marked with an “H” or a “T” to show they are:
J) A) Heat resistant
B) Hard finished
C) Half threaded
D) Corrosion resistant
E) Fire proof
199. The rotating part of a micrometer is the:
K) Anvil
L) Barrel
M) Frame
N) Thimble
O) Cover
200. An advantage of aluminum pistons compared to cast iron pistons is:
K) Greater high temperature strength
L) Greater weight per cubic meter
M) Increased resistance to wear
N) Low temperature strength
O) Better heat conductivity
201. Trunk type diesel engine pistons are most effectively cooled when heat is:
U) Radiated through the engine block
V) Mixed with lubrication oil
W) Conducted through the piston crown
X) Transferred to escaping exhaust gases
Y) Transferred to water cooled cylinder walls
202. Cavitation, the forming and bursting of vapor filled cavities or bubbles will result in ..................................
P) A loss of thrust
Q) Erosion of the blade surface
R) Vibrations in the afterbody of the ship
S) Noise
T) All above
203. When the oil in the seperator is decreasing, which place cannot be leaking?
P) Lower bearing casing
Q) Drum shaft
R) Wormgear shaft bearing hosing
S) Middle ball bearing casing
T) The o-ring at shock water entrance to seperator into shockwater
204. ------------should be regarded as a special attention after installing a new hydraulic pump.
A) The relief filters should be readjusted
B) The filters and strainers should be checked frequently
C) System pressures should be readjusted
D) The fluid should be drained and renewed
E) All above
205. All details of fuel bunkering, ballast handling, tank cleaning or slop disposal must be entered in the ...............................................
K) Rough log
L) Engine room log
M) Oil record book
N) Smooth log
O) A and B
206. It shall be the responsibility of the ------------------- to prepare the boilers for inspection.
U) Chief Engineer
V) 2nd Engineer
W) Boatswain
X) 2nd officer
Y) Any above organization
207. Performance of a turbocharged engine can be improved by:
F) Decreasing valve over lap
G) Preheating
H) Aftercooling intake air
İ) Preheating light fuels
J) Heating intake air
208. When maneuvering, you discover heavy smoke coming from the turbocharger casing. You should:
F) Check the air filter for dirt
G) Check for an exhaust leak
H) Check the cooling water temperature
İ) Notify the bridge and ask to shut the engine down
J) Check fuel oil consumption
209. A device which will function to bring an engine to a full stop in order to protect it from damage due to excessively high speed is known as a/an:
F) Torque limiter
G) Overspeed trip
H) Overspeed governor
İ) Load limit governor
J) Any of above
210. The bulb for the TEV (thermostatic expansion valve) is located:
A) In the middle of the evaporator coils
B) Near the evaporator coil outlet
C) Near the evaporator coil inlet
D) On the bottom row of the evaporator
E) None of the above
211. The solenoid valve can be typed as a:
A) Thermal valve
B) Magnetic stop valve
C) Bellows valve
D) Bimetallic valve
E) Both C and D
212. Worn bearings, rings, and valves all contribute to:
A) Poor reversal
B) Quiet operation
C) Hard starting
D) High pressure
E) None of the above
213. Regardless of the geographical location of on oil spill, you should notify the ---------------
A) Local police department
B) Local fire department
C) Corps of Engineers
D) Coast Guard
E) The pilot
214. The valve which is always partially open when the evaporator is in operation is the:
U) Vapor valve
V) Continuous blowdown valve
W) Bottom blowdown valve
X) Surface blowdown valve
Y) Fresh water valve
215. On a diesel engine, a freshwater heat exchanger is used rather than a saltwater one to:
A) Maintain fuel oil temperature
B) Maintain lube oil temperature
C) Cut down on rust and corrosion
D) Keep the engine block from freezing in cold weather
E) Maintain air temperature
216. If a bilge pump failed to build up discharge pressure, you should check for:
A) Excessive water in the bilges
B) A clogged suction strainer
C) Oil in the bilges
D) A closed skin valve
E) None of the above
217. Emulsification of oil will occur when mixed with:
A) Air
B) Water
C) Black oil
D) Ice cream
E) Oxygen
218. Any electric motor can be constructed to be --------------------proof.
A) Short
B) Ground
C) Explosion
D) Overload
E) A and B
REFRIGERATION QUESTIONS
219. Low head pressure can be caused by:
A- too mach or too cold cndensing water
B- Leaky discharge valves
C- Insuficient charge refrigerant
D- Any of above
220. If the termostatic expantion valve did not appear to be functioning
properly,the cause could be:
A- foreing matter in the valve
B- ruptured control bulb tubbing
C- moisture in the system
D- any of above
221. The density of the brane solution is measured with:
A- litmus paper
B- chemical test
C- a hydrometer
D- A or B
222 . which of the following would not be cause for a refrigerating system to short cycle on HP cutout
A- discharge valve leaking
B- pressure cutout set incorrectly
C- system overcharged with refrigerant
D- insufficient cooling water
223. excessive head pressure is caused by:
A- air or noncndensable gas in the system
B- dirty condencer tubes
C- insufficient cooling water to condencer
D- any of above
224. The capaciti of a centrifugal type compressor is controlled by:
A- regulating the discharge pressure
B- regulating the speed
C- regulating the suction pressure
D- B or C
225. Solenoid coil is installed:
A- vertically above the valve
B- horizantally above the valve
C- vertically below the valve
D- horizontally below the valve
226. when purging refrigeration system,compressor is:
A- running
B- running but condencer secured
C- shut down
D- running with the bypass open
227. when opening single packed stop valve
A- loosen packing before opening
B- tighten packing before opening
C- check to see that the seal is not scored
D- non of the above
228. Excessive head pressure is caused by:
A- flooded condencer tube
B- too mach cooling water to condencer
C- cooling water temperature too high
D- A or C
229. Everything is in its normal operation position when charging a system except the:
A- compressor discharge valve
B- purge valve
C- solenoid valve
D- king (receiver discharge) valve
230. when making repairs to refridgeration system, which of the following safety precautions is not necessery
A- vantilate area
B- have O.B.A. avilable
C- keep flame and open light away
D- wear goggles
231. A hot suction line may be caused by:
A- lack of the refrigerant
B- insufficient condensing cooling water
C- excess refrigeration
D- B or C
232. Both temperature and pressure increased in the:
A- compressor
B- condencer
C- evaporator
D- B or C
233. The refrigerant temperature is at its maximum just before it enters the:
A- expantion valve
B- compressor
C- condenser
D- evaporatior
234. The greatest decrease in refrigerant temperature occurs in the:
A- evaporator
B- compressor
C- condenser
D- A or C
235. Storage tank for liquid refrigerant is called as:
A- receiver tank
B- charging tank
C- purging tank
D- any of the above
236. Precooler is sometimes installed between the:
A- compressor and condenser
B- condencer and expantion valve
C- expantion valve and evaporator
D- evaporator and compressor
237. the solenoid valve controls the:
A- pressure in the evaporator coils
B- amount of the refrigerant entering the evaporator
C- flow of refrigerant to the expantion valve
D- amount of circulating water to the condenser
238. Closing solenoid valve will stop the compressor through the:
A- low water pressure cutout switch
B- bypass releif valve
C- low-pressure cutout switch
D- high pressure cutout switch
239. Four basic methods of the detarmaining wether the proper amont of refigerant being added to the system are:
A- bull’s –eye weight,pressure and frost line
B- temperature,weight,pressure and frost line
C- bull’s –eye, weight,pressure and dip stick
D- bull’s –eye, weight,litmus test and frost line
240. Liquid’’slugging’’is caused by:
A- liquid in the compressor clearence space
B- excessive liquid refrigerant in the receiver
C- the precence of the liquid in the condenser causing excessive noise
D- the pounding of the liquid refrigerant in the suction line at the point
of restriction
241. All refrigerator compressor valve opened and closed by:
A- a cam shaft C- springs
C- pressure diferential D- B or C
242. Hidden heat in refrigeration work is feferred to as:
A- sensible heat C- latent heat
B- heat intensity D- A or C
243. Bull’’s-eye in full liquid line will appear
A- cloudy B- clear C- bubbly D- light brown color
244. A compressor capacity reduction devise reduces compressor kapasity;
A- by reducing the compressor speed
B- bypassing hot gas
C- as the refrigerant load dictates
D- by reducing compressor horsepower proportionately
