Motor Engineering – MEO CLASS 4 MMD PAPER

31. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to
    1. the quality of fuel
    2. the quality of servicing of the governor in the last port.
    3. the supply of charge air
    4. the overhaul of fuel injectors done in the last decarbonisation single B multi A B

ANS.: B

32. An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to
    1. the quality of fuel
    2. the quality of servicing of the governor in the last port.
    3. the supply of charge air
    4. the overhaul of fuel injectors done in the last decarbonisation

ANS.: A,B

33. In any diesel engine closed freshwater cooling system, the lowest pressure exists at the _____________.           

1. jacket water outlet
2. cooling water pump outlet
3. heat exchanger outlet
4. expansion tank atmospheric vent

ANS.: D

34. The main advantage of unit injectors over other fuel injection systems is  _____. 

1. Reducing the need of too many high pressure fuel lines
2. their relatively low injection pressures
3. reduced wear of spray orifices
4. the lessened chance of fuel leaks into the engine sump

ANS.: A

35. Cooling the intake air supplied to a diesel engine will _____________.

1. reduce mean effective pressure
2. decrease average compression pressure
3. decrease air charge density
4. increase power output

ANS.: D

36. When there is a flame failure in an automatically fired auxiliary boiler, the _________.

1. air supply is shut off
2. fuel supply is shut off
3. water feed is shut off
4. safety valve lifts

ANS.: B

37. Lubrication for the main reduction gears used with diesel engines is usually supplied by _____

1. oil from the main engine sump
2. an independent lube oil system
3. the stern bearing head tank
4. the stern bearing sump tank

ANS.: B

38. Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve? 

1. Electric power
2. Lube oil standby pump
3. Hydraulic switch
4. Motor drain

ANS.: A

39. What is to be installed on an internal combustion engine if its cylinder bore exceeds 200mm? 

1. Crankcase vapor monitors
2. Engine exhaust silencers
3. Constant pressure type turbochargers
4. Explosion relief valves

ANS.: D

40.Which of the following actions should normally be taken during each watch when the auxiliary boiler is in operation?

1. Clean the flame scanner photocell window.
2. Inspect and clean all solenoid valves.
3. Lift the safety valves by hand.
4. Inspect for oil or water leaks.

ANS.: D

41. Excessive vibration of an automatically fired auxiliary boiler can be caused by __________.

1. air or water in the furnace
2. combustion pulses
3. fuel oil pump failure
4. flame failure

ANS.: B

42. A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by uscg178?

1. carbon on the register doors
2. a dazzling white atomizer flame
3. fluctuating pressure in the windbox
4. an unevenly shaped burner flame

ANS.: D

43. The highest pressure in any closed diesel engine freshwater cooling system is at the ___           

1. jacket water outlet
2. expansion tank inlet
3. heat exchanger inlet
4. cooling water pump outlet

ANS.: D

44. Which of the following statements describes the function of an alarm enunciator on an engine room alarm panel?

1. An alarm condition causes a light and siren to come on which remain on until the machinery is secured.
2. A flashing light comes on, followed by an audible alarm. When an alarm acknowledge button is depressed, the audible alarm is silenced and light stays on.
3. An alarm condition gives an audible and visual alarm signal, both of which are secured when the alarm acknowledge button is depressed.
4. An alarm condition causes a flashing light to come on, followed by an audible alarm. When the alarm acknowledge button is depressed, the warning light is extinguished.

ANS.: B

45. Excessive leakage and premature failure of valve packing is a result of ____________.

1. opening a valve too quickly
2. jamming a valve in the closed position
3. low pressure fluid flow through the pipeline
4. a scored valve stem

ANS.:  D

46. The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner _______________.

1. in the event of a flame failure
2. in the event of a stack fire
3. when the water level reaches the crown sheet
4. when the feed pump discharge pressure drops to a preset minimum

ANS.: A

47. If the combustion control system of an automatically fired auxiliary boiler fails to restart from the normal shutdown mode, you should check for ______________.

1. broken or grounded high tension leads
2. a faulty ignition cable connector
3. an incorrect electrode setting
4. all of the above

ANS.: D

48. When taking tank soundings on a ship, coating the tape with chalk helps to ____________.

1. better identify the correct reading
2. show the depth of any water in an oil tank
3. make the tape roll easier
4. reduce possibility of sparks

ANS.: A

49. When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used ____________.                                

1. at high loads to prevent overheating
2. at low loads to prevent corrosion in the boiler
3. during periods of high steam demand
4. when the turbocharger is in operation

ANS.: B

50. It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to __________

1. give warning that excessive boiler pressure has been reached
2. prevent wire drawing of the disc and seat
3. prevent valve pounding
4. provide sufficient blowdown

ANS.: B

51. Which of the following statements is correct regarding grades of pipe?

1. Stainless steel pipe is manufactured in four general grades.
2. Brass pipe is manufactured in three common grades.
3. Copper pipe is manufactured in two common grades.
4. The term “extra strong” is normally associated with schedule 160 steel pipe

ANS.: C

52. The crankcase of many diesel engines are kept under a slight vacuum by the ____________

1. scavenging action of the piston
2. piston type vacuum pump taking suction off a differential manometer
3. gland exhausting manometer
4. crankcase exhaust fan

ANS.: D

53. Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of  lubricating oil systems?            

1. Splash
2. Gravity
3. Pressure
4. Bypass

ANS.: C

54. Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle, turbocharged, diesel engine?    

1. Clogged air intake filters
2. Piston blow-by
3. A defective after cooler
4. Faulty exhaust valves

ANS.: C

55 . When may the crankcase ventilation pipes or oil drain pipes of two or more engines be connected? 

1. Propulsion engines under 1000 shaft horsepower may share a common crankcase vent provided the oil drains remain
2. In most cases it is desirable and cost effective for propulsion engines to share a common crankcase ventilation and monitoring system.
3. No interconnection may be made between the crankcase ventilation pipes or oil drain pipes
4. None of the above are correct.

ANS.: C

56. Which of the following statements describes the unchecked growth of microbiological organisms within a fuel system?

1. The dying bacteria will cause a coating to be formed on the sides of the tank thereby decreasing corrosion.
2. The fuel in the tank will loose its fluidity, solidify, and be the cause of an expensive removal process.
3. Corrosion of various metal components will occur due to the formation of hydrogen sulfide gas.
4. All of the above are correct.

ANS.: C

57. If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be

1. high steam pressure in the boiler
2. abnormally high feed water temperature
3. abnormally high boiler water temperature
4. steam demand exceeding feed pump capacity

ANS.: B

58. When lighting off an auxiliary boiler, which of the problems listed could cause the burners to sputter?

1. Cold fuel oil
2. Low fuel oil pressure
3. Low atomizing steam pressure
4. Water in the fuel oil

ANS.: D

59. Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?

1. A temperature sensing device opens the circuit breaker in the burner motor.
2. The high limit control secures power to the entire oil firing system.
3. The stack relay actuates the low limit control which breaks the ignition circuit.
4. The stack relay secures power to the high voltage side of the ignition transformer.

ANS.: B

60.Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent __________.

1. excessive crankcase pressure
2. excessive lube oil temperature
3. contamination of the lube oil by water
4. contamination of the cooling water by lube oil

ANS: C

61. Subtracting the return flow meter reading from the supply flow meter reading on a boiler equipped with a return flow fuel oil system, determines the amount of oil ____________.

1. circulated by the system
2. burner throughput
3. returned to the settler
4. discharged from the pump

ANS.: B