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問題一覧

Piston area, multiplied by piston stroke, multiplied by number of cylinders, equals engine ?

•ÂÂ displacement

One of the major components of centrifugal pump is ?

•impeller

3. An important point of consideration when replacing a dry type intake filter on an air compressor is to

•select the proper size filter so that air flow is not restricted

4. One of three available centrifugal sea water service pumps is in operation with a sea water temperature of 50 deg fahrenheit. The cooling temperature of all systems supplied by this pump appear to be high. Therefore, which of the following is required?

•start a second pump and place it on line, close the discharge valve on the original pump and watch for a rise in the discharge pressure

5. It is possible to mount a double suction centrifugal pump impeller with the vanes facing the wrong direction. This would cause the pump

•efficiency to decrease

6. The primary objective of the auxiliary exhaust system is to supply steam to ?

•Dearating feed tank

7. Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in ?

•Â Â increased horsepower

8. To prevent fire inside scavenge air spaces in marine diesel engines, it is important that it should be occasionally?

•drained

9. If it becomes necessary to clean the spray holes of a fuel injector in a diesel engine which of the following is to be used ?

•carbon solvent

10. When there is excessive formation of frost in the evaporator coils, it will ?

•reduce efficiency of refrigerating plant

11. At what temperature in degree Celsius will safety devices called fusible plug installed in air compressor or compressed air system melts in order to prevent explosion-?

•100

12. What is the meaning of static suction head of a pump?

•distance the suction liquid level is below the center line of the pump.

13. Which of these bearings listed below is preferred by makers for use in the engine room supply blowers?

•Ball

14. A loud clicking noise occuring from within the valve compartment of an operating diesel engine would indicate ?

•excessive valve clearance

15. Any unusual or new vibration in the hull or propeller shafting can be an indication of

•propeller imbalance

16. In a single-acting diesel engine. The cylinder liner area that is most difficult to lubricate is the ?

•minor thrust side

17. What part of an engine has the function of measuring the speed and changing the fuel control---------?

•Governor

18. What is the primary function of a fuel delivery check valve assembly ?

•To provide rapid fuel injection cut-off

19. The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work, which is known as ?

•friction horsepower

20. The function of the spring used with channel or plate-type valves for reciprocating air compressors is to

•provide positive closing of the valves

21. Air compressor cylinder unloader enable the compressor to ?

•start and come up to speed before air compression begins

22. What is the function of double-volute casing of a centrifugal pump?

•reduce radial thrust to the impeller

23. What part of a refrigeration system reduces the pressure of a liquid refrigerant?

•Expansion valve

24. One method of constructing large marine diesel engines and reducing the total engine frame weight is through?

•welding plates to form sections for assembly.

25. Jacket water temperature in a closed cooling system of a diesel engine is normally controlled by ?

•the operation of the thermostatic valve

26. Which of the following will increase when fuel oils are heated ?

•volume

27. The capacity of a rotary pump will decrease with an increase in the pump

•rotor clearance

28. Moisture in a refrigeration system will cause a

•faulty expansion valve.

29. Where are moisture shields located in a main propulsion steam turbine?

•On the last stages of the rotor blading

30. Breaking the fuel into fine spray to provide good combustion is called,

•atomizing

31. Why cruise ship is one one of the main candidates for gas turbine propulsion?

•The compactness of gas turbine machinery can be exploited to create extra accommodation

32. An axial pisto, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/cylinder barreland will

•cause damage to the pump if not continually drained from the pump casing

33. What is mainly the reason why fuel injectors used in heavy fuel oil systems are provided with cooling?

•To reduce carbon accumulation on the nozzles

34. What is the purpose of maintaining an electrical lamp inside the boiler during a dry preservation method ?

•To accelerate the drying process

35. Which of the valves listed below permits its flow in only one direction?

•Check valve

36. The fundamental difference between a 2-stroke and a 4-stroke engine is in the number of ?

•piston strokes each one needs to complete a combustion cycle

37. Which of the following is used extensively to lubricate rolling contact bearing ?

•Grease

38. Some engines are using auxiliary electrically driven blowers, which is continuosly running during maneuvering, and automatically cut-off, if the scavenge air pressure reaches_ load.

•50%

39. The set point pressure at which the boiler safety valve is to lift to ?

•Maximum stean drum pressure

40. If the control pressure for an automatic combustion control system is lost during maneuvering, you should

•switch to manual control

41. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by ?

•a liquid seal

42. The function of the hydraulic telemotor transmitter used in an electro hydraulic steering gear system is to

•transmit the rudder angle to the bridge indicator

43. Having high exhaust temperatures would affect the ?

•efficiency of the engine

44. In relation to air conditioning system, where is the latent heat of water vapor depends ?

•dew point

45. What needs to be done in order to maintain the gas turbine sustainable power output?

•Compressor washing,

46. The heat gained per pound of refrigerant in the evaporator is known as they

•refrigerating effect

47. Which of the following purpose of a safety valve fitted in the cylinder cover of a diesel engine?

•To release excessive gas pressure from the cylinder

48. In a distilling plant, in order to achieve full liquifaction in the condenser, Refrigerant vapour from the evaporators is compressed to a higher pressure. It is because of what purpose.

•Raise the boiling point

49. What is the most effective method in removing water from diesel fuel oil ?

•By centrifuging the fuel

50. A pounding noise in a steam cylinder in a mooring winch could be caused by ?

•excessive bearing clearance

51. What cause carbon deposits on the boiler burner throat ring?

•A dirty atomizer sprayer plate

52. In a water-tube boiler, how is water level confirmed?

•Gauge glass

53. What may happen if bubbles are present in a refrigeration system?

•Bubbles may carry moisture that may lead to corrosion.

54. In the refrigeration system, the refrigerant absorbs the latent heat of vaporization in the ?

•evaporator

55. Why is the heating capacity of the fuel oil heater reduced when there is a build up of carbonization in the heater surfaces ?

•Because thermal conductivity of solidified contaminant is poor

56. Scavenging fire occur if the engine piston rings are ?

•leaking

57. Sub-cooling is the method of reducing the temperature of the liquid refrigerant below its ?.

•condensing temperature

58. How can we quickly reduce high water level in a steaming boiler?

•By the used of surface blow valve

59. Humidity is the measure of the ?

•water vapor content

60. Which turbocharger component increases air density and helps improve engine operating efficiency?

•After cooler

61. The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine

•journal bearings

62. Excess refrigerant in a refrigeration system is normally removed from the

•charging connection of the system.

63. How is power transfered from the main engine located deep inside the hull of a vessel to the propeller at the aft?

• Via intermediate and propeller shaft

64. Which one of the following devices use to control the admission of steam to the steam cylinder of a reciprocating pump ?

•Pilot valve and operating rod

65. Cylinder inlet valve failure in a low pressure air compressor can be caused by ?

•sticking valves due to carbon buildup on the seats

66. When should be a boiler water sample be taken for testing?

•Before the boiler has been blown down or chemicals added

67. What is the possible cause why a lube oil pump fails to build up discharge pressure?

•suction valve is closed

68. What is the heat exchanger used to heat the boiler feed water by means of waste gas as it passes from the boiler to the stack?

•Economizer

69. The most common problem encountered by turbo-chargers in a two-stroke engine is ?

•surging

70. The amount of supplied fuel oil on the boiler atomizer depends on the ?

•Fuel pressure

71. If the existing vapour pressure is subtracted from the indicated pressure at the pump suction, the remainder is the ?

•apparent net positive suction head

72. When the hydraulic control lever for a deck winch is placed in the neutral or off position, the spring set brake on the fluid motor drive shaft is

•engaged by spring action and only released by hydraulic pressure

74. Oil mist detector is an instrument used to detect an oil mist formation in the engine crankcase , what cause oil formation ?

•Overheating of oil

73. What is the purpose of the boiler drum air cock?

•permit escape of air when steam is forming in the drum after lighting off

75. The demisters installed in a flash-type evaporator serve to ?

•Remove small water droplets entrained in the flashed vapor.

76. In a large, low-speed diesel engine the clearance between the piston crown and cylinder

•insert shims between the crankpin bearing box and the connecting rod foot

77. Increasing the valve clearance of a diesel engine intake valve will cause the valve to open ?

•later and have greater lift

78. Condensers located in the various stages of the flash evaporator are cooled by ?

•seawater

79. What would be the result if the fuel used for boiler burners has sediments?

•Clogged atomizer tips

80. The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as ?

•ÂÂ brake horsepower

81. When operating under constant load, the superheated steam temperature may rise above normal it

•feed water temperature is too low

82. An engineer on duty inspecting an unmanned engine room at night should be aware of which of the following precautions ?

•Switch on the dead man alarm upon entering the control room

83. You observedan efficiency drop caused by compressor fouling of the gasturbine, what is the most effective counter measure to carry out?

•Off-line washing

84. In a fuel oil burner having a standard mechanical atomizer, the fuel and air are mixed as the fuel leaves the ?

•orifice

85. The difference between the setpoint and the measured parameter in an automatic flow controller is called:

•Error

86. Why diesel engine lubricating oil need more purification compare with the lubricating oil in a gas turbine?

•Gas turbine lubricant does not come into contact with the combustion process

87. The pressure developed in the high pressure cylinder of a reciprocating air compressor, in order to assure an output near the end of its compression stroke, is ?

•above the line discharge pressure

88. Feedwater supplied to a flash type distilling plant will flash to vapor in the first-stage due to ?

•flash chamber pressure being lower than the saturation pressure corresponding to the feedwater temperature

89. Every automated machinery plant must have an engineers assistance alarm. Power for this alarm should be taken from the

•general alarm power supply

90. If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the ?

•control air system

91. If the exhaust oil is returned directly to the pump suction, what type of hydraulic circuit is the system?

•closed loop

92. Explain what is the use of Stern tube ?

•support and seal the propeller shaft

93. The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at ?

•crankshaft speed in a two-stroke cycle diesel engine

94. A centrifugal pump may fail to deliver water when first started if the

•seal ring is improperly located

95. Boiler safety valves are set not to go above maximum operating pressure of higher than ?

•10%

96. Which of the following is used as moisture arrester and dryer in the refrigeration system?

•Silica gel

97. Fuel oil enters the main engine cylinder through?

•fuel oil injector

98. Gland sealing steam is used during steam turbine operation to prevent the loss of

•vacuum

99. The operation of a thermostatic steam trap depends upon the ?

•change in the amount of vapor produced within an enclosed chamber

100

100. Which combination of the main shaft segments listed below that are located furthest from the main engine are connected by the inboard stern tube shaft coupling?

•Line shaft and stern tube shaft

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問題一覧

Piston area, multiplied by piston stroke, multiplied by number of cylinders, equals engine ?

•ÂÂ displacement

One of the major components of centrifugal pump is ?

•impeller

3. An important point of consideration when replacing a dry type intake filter on an air compressor is to

•select the proper size filter so that air flow is not restricted

•start a second pump and place it on line, close the discharge valve on the original pump and watch for a rise in the discharge pressure

5. It is possible to mount a double suction centrifugal pump impeller with the vanes facing the wrong direction. This would cause the pump

•efficiency to decrease

6. The primary objective of the auxiliary exhaust system is to supply steam to ?

•Dearating feed tank

7. Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in ?

•Â Â increased horsepower

8. To prevent fire inside scavenge air spaces in marine diesel engines, it is important that it should be occasionally?

•drained

9. If it becomes necessary to clean the spray holes of a fuel injector in a diesel engine which of the following is to be used ?

•carbon solvent

10. When there is excessive formation of frost in the evaporator coils, it will ?

•reduce efficiency of refrigerating plant

11. At what temperature in degree Celsius will safety devices called fusible plug installed in air compressor or compressed air system melts in order to prevent explosion-?

•100

12. What is the meaning of static suction head of a pump?

•distance the suction liquid level is below the center line of the pump.

13. Which of these bearings listed below is preferred by makers for use in the engine room supply blowers?

•Ball

14. A loud clicking noise occuring from within the valve compartment of an operating diesel engine would indicate ?

•excessive valve clearance

15. Any unusual or new vibration in the hull or propeller shafting can be an indication of

•propeller imbalance

16. In a single-acting diesel engine. The cylinder liner area that is most difficult to lubricate is the ?

•minor thrust side

17. What part of an engine has the function of measuring the speed and changing the fuel control---------?

•Governor

18. What is the primary function of a fuel delivery check valve assembly ?

•To provide rapid fuel injection cut-off

19. The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work, which is known as ?

•friction horsepower

20. The function of the spring used with channel or plate-type valves for reciprocating air compressors is to

•provide positive closing of the valves

21. Air compressor cylinder unloader enable the compressor to ?

•start and come up to speed before air compression begins

22. What is the function of double-volute casing of a centrifugal pump?

•reduce radial thrust to the impeller

23. What part of a refrigeration system reduces the pressure of a liquid refrigerant?

•Expansion valve

24. One method of constructing large marine diesel engines and reducing the total engine frame weight is through?

•welding plates to form sections for assembly.

25. Jacket water temperature in a closed cooling system of a diesel engine is normally controlled by ?

•the operation of the thermostatic valve

26. Which of the following will increase when fuel oils are heated ?

•volume

27. The capacity of a rotary pump will decrease with an increase in the pump

•rotor clearance

28. Moisture in a refrigeration system will cause a

•faulty expansion valve.

29. Where are moisture shields located in a main propulsion steam turbine?

•On the last stages of the rotor blading

30. Breaking the fuel into fine spray to provide good combustion is called,

•atomizing

31. Why cruise ship is one one of the main candidates for gas turbine propulsion?

•The compactness of gas turbine machinery can be exploited to create extra accommodation

32. An axial pisto, variable stroke pump is used in a vessel's hydraulic steering gear. Under pressure, oil continually leaks out from between the valve plate/cylinder barreland will

•cause damage to the pump if not continually drained from the pump casing

33. What is mainly the reason why fuel injectors used in heavy fuel oil systems are provided with cooling?

•To reduce carbon accumulation on the nozzles

34. What is the purpose of maintaining an electrical lamp inside the boiler during a dry preservation method ?

•To accelerate the drying process

35. Which of the valves listed below permits its flow in only one direction?

•Check valve

36. The fundamental difference between a 2-stroke and a 4-stroke engine is in the number of ?

•piston strokes each one needs to complete a combustion cycle

37. Which of the following is used extensively to lubricate rolling contact bearing ?

•Grease

38. Some engines are using auxiliary electrically driven blowers, which is continuosly running during maneuvering, and automatically cut-off, if the scavenge air pressure reaches_ load.

•50%

39. The set point pressure at which the boiler safety valve is to lift to ?

•Maximum stean drum pressure

40. If the control pressure for an automatic combustion control system is lost during maneuvering, you should

•switch to manual control

41. Air leakage between the shaft and stuffing box packing in a centrifugal pump is prevented by ?

•a liquid seal

42. The function of the hydraulic telemotor transmitter used in an electro hydraulic steering gear system is to

•transmit the rudder angle to the bridge indicator

43. Having high exhaust temperatures would affect the ?

•efficiency of the engine

44. In relation to air conditioning system, where is the latent heat of water vapor depends ?

•dew point

45. What needs to be done in order to maintain the gas turbine sustainable power output?

•Compressor washing,

46. The heat gained per pound of refrigerant in the evaporator is known as they

•refrigerating effect

47. Which of the following purpose of a safety valve fitted in the cylinder cover of a diesel engine?

•To release excessive gas pressure from the cylinder

48. In a distilling plant, in order to achieve full liquifaction in the condenser, Refrigerant vapour from the evaporators is compressed to a higher pressure. It is because of what purpose.

•Raise the boiling point

49. What is the most effective method in removing water from diesel fuel oil ?

•By centrifuging the fuel

50. A pounding noise in a steam cylinder in a mooring winch could be caused by ?

•excessive bearing clearance

51. What cause carbon deposits on the boiler burner throat ring?

•A dirty atomizer sprayer plate

52. In a water-tube boiler, how is water level confirmed?

•Gauge glass

53. What may happen if bubbles are present in a refrigeration system?

•Bubbles may carry moisture that may lead to corrosion.

54. In the refrigeration system, the refrigerant absorbs the latent heat of vaporization in the ?

•evaporator

55. Why is the heating capacity of the fuel oil heater reduced when there is a build up of carbonization in the heater surfaces ?

•Because thermal conductivity of solidified contaminant is poor

56. Scavenging fire occur if the engine piston rings are ?

•leaking

57. Sub-cooling is the method of reducing the temperature of the liquid refrigerant below its ?.

•condensing temperature

58. How can we quickly reduce high water level in a steaming boiler?

•By the used of surface blow valve

59. Humidity is the measure of the ?

•water vapor content

60. Which turbocharger component increases air density and helps improve engine operating efficiency?

•After cooler

61. The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine

•journal bearings

62. Excess refrigerant in a refrigeration system is normally removed from the

•charging connection of the system.

63. How is power transfered from the main engine located deep inside the hull of a vessel to the propeller at the aft?

• Via intermediate and propeller shaft

64. Which one of the following devices use to control the admission of steam to the steam cylinder of a reciprocating pump ?

•Pilot valve and operating rod

65. Cylinder inlet valve failure in a low pressure air compressor can be caused by ?

•sticking valves due to carbon buildup on the seats

66. When should be a boiler water sample be taken for testing?

•Before the boiler has been blown down or chemicals added

67. What is the possible cause why a lube oil pump fails to build up discharge pressure?

•suction valve is closed

68. What is the heat exchanger used to heat the boiler feed water by means of waste gas as it passes from the boiler to the stack?

•Economizer

69. The most common problem encountered by turbo-chargers in a two-stroke engine is ?

•surging

70. The amount of supplied fuel oil on the boiler atomizer depends on the ?

•Fuel pressure

71. If the existing vapour pressure is subtracted from the indicated pressure at the pump suction, the remainder is the ?

•apparent net positive suction head

72. When the hydraulic control lever for a deck winch is placed in the neutral or off position, the spring set brake on the fluid motor drive shaft is

•engaged by spring action and only released by hydraulic pressure

74. Oil mist detector is an instrument used to detect an oil mist formation in the engine crankcase , what cause oil formation ?

•Overheating of oil

73. What is the purpose of the boiler drum air cock?

•permit escape of air when steam is forming in the drum after lighting off

75. The demisters installed in a flash-type evaporator serve to ?

•Remove small water droplets entrained in the flashed vapor.

76. In a large, low-speed diesel engine the clearance between the piston crown and cylinder

•insert shims between the crankpin bearing box and the connecting rod foot

77. Increasing the valve clearance of a diesel engine intake valve will cause the valve to open ?

•later and have greater lift

78. Condensers located in the various stages of the flash evaporator are cooled by ?

•seawater

79. What would be the result if the fuel used for boiler burners has sediments?

•Clogged atomizer tips

80. The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as ?

•ÂÂ brake horsepower

81. When operating under constant load, the superheated steam temperature may rise above normal it

•feed water temperature is too low

82. An engineer on duty inspecting an unmanned engine room at night should be aware of which of the following precautions ?

•Switch on the dead man alarm upon entering the control room

83. You observedan efficiency drop caused by compressor fouling of the gasturbine, what is the most effective counter measure to carry out?

•Off-line washing

84. In a fuel oil burner having a standard mechanical atomizer, the fuel and air are mixed as the fuel leaves the ?

•orifice

85. The difference between the setpoint and the measured parameter in an automatic flow controller is called:

•Error

86. Why diesel engine lubricating oil need more purification compare with the lubricating oil in a gas turbine?

•Gas turbine lubricant does not come into contact with the combustion process

87. The pressure developed in the high pressure cylinder of a reciprocating air compressor, in order to assure an output near the end of its compression stroke, is ?

•above the line discharge pressure

88. Feedwater supplied to a flash type distilling plant will flash to vapor in the first-stage due to ?

•flash chamber pressure being lower than the saturation pressure corresponding to the feedwater temperature

89. Every automated machinery plant must have an engineers assistance alarm. Power for this alarm should be taken from the

•general alarm power supply

90. If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the ?

•control air system

91. If the exhaust oil is returned directly to the pump suction, what type of hydraulic circuit is the system?

•closed loop

92. Explain what is the use of Stern tube ?

•support and seal the propeller shaft

93. The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at ?

•crankshaft speed in a two-stroke cycle diesel engine

94. A centrifugal pump may fail to deliver water when first started if the

•seal ring is improperly located

95. Boiler safety valves are set not to go above maximum operating pressure of higher than ?

•10%

96. Which of the following is used as moisture arrester and dryer in the refrigeration system?

•Silica gel

97. Fuel oil enters the main engine cylinder through?

•fuel oil injector

98. Gland sealing steam is used during steam turbine operation to prevent the loss of

•vacuum

99. The operation of a thermostatic steam trap depends upon the ?

•change in the amount of vapor produced within an enclosed chamber

100

100. Which combination of the main shaft segments listed below that are located furthest from the main engine are connected by the inboard stern tube shaft coupling?

•Line shaft and stern tube shaft