competence 4.1

通報

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 above 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. What is the importance of the control box of a differential gear system in steering gear system

• it compares the bridge signal to the actual rudder angle through the follow up gear

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

competence 4.2

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