Motor Engineering – MEO CLASS 4 MMD PAPER

55) In the preheater before purifier the recommended heavy oil preheat is-

1. 85C
2. 98C
3. 110C
4. 120c

56) For a ME which has a 5 micron fuel filter, a homogenizer ( omega fire ) is usually fitted –

1. before the purifier
2. after the purifier
3. after the 5 micron filter to ME
4. before the horizontal clarifier

ANS.: B

57)For a main engine fuel system which has a 5 micron filter ,a super decanter is usually fitted—

1. before the purifier
2. after the purifier
3. after the 5 micron filter to ME
4. before the horizontal clarifier

ANS.: A

58) For low sulphur 380 cst fuels the TBN of MECC oil should be in the region of—

1. 20
2. 40
3. 60
4. 70

ANS.: A

59) Using a MECC oil of high TBN can cause—

1. improper centrifuging of water
2. Calcium laquer deposits on bearings
3. sludge formation with water in ME sump
4. all of above

ANS.: D

60) When using a high TBN MECYL oil and suddenly the ship has to use low sulphur 380 cst HO in the ME, due to SECA area entry—

1. reduce the feed of ME CYL
2. increase the feed of ME CYL
3. do not change the feed rate
4. increase the TBN of the ME CYL

ANS.: A

61) ME scavenge air temperature is adjusted by-

1. controlling the sea water inlet
2. controlling the sea water outlet
3. keeping outlet valve 100% open always.
4. none of above

ANS.: B

62) The ME jacket FW cooling outlet temperature is-

1. 80C
2. 95C
3. 50C
4. 55C

ANS.: A

63) The scavenge air high temperature set point for 2 stroke ME is

1. 40C
2. 55C
3. 65C
4. 35C

ANS.: B

64) You see white smoke coming from the ME funnel stack, this could be

1. one or more cylinders not getting enough fuel
2. too low compression pressure
3. water in fuel
4. all of above

ANS.: C

65) The crank angles of a 2 stroke engine are— 

1. 2 cylinder engine/ 90 degrees
2. 4 cylinder engine/ 60 degrees
3. 6 cylinder engine/ 90 degrees
4. 4 cylinder engine/ 90 degrees

ANS.: D

66) Crankcase explosions of main engines can be due to-

1. over heating of MECC oil
2. poor condition of liners/ rings
3. crankshaft / thrust bearing failure
4. all of above

ANS.: D

67) If there is air in the fuel oil filter, the compression and re expansion of air will—

1. not allow the fuel injection valve to close
2. not allow the fuel injection valve to open
3. makes no difference
4. none of the above

ANS.: B

68)  Which of the bearings listed are most widely used for the main and connected rod bearings of a diesel engine?

1. roller
2. sleeve
3. precision insert
4. needle

ANS.:  C

69)  Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?

1. splash lubrication
2. pressure lubrication
3. sight feed lubricators
4. mechanical lubricators

ANS.: B

 70)  In a naturally aspirated diesel engine, the volume of air intake is directly related to engine

1. compression ratio
2. valve size
3. fuel pressure
4. cylinder clearance volume

ANS.: B

71)  In a bypass filtering system for a medium or high speed diesel engine, the lube oil bypassing the filter

1. returns directly to the suction side of the pump
2. returns directly to the sump
3. flows to the engine bearings
4. flows through a second-stage strainer, reheater, and returns to the sump

ANS.: C

72)  In a diesel engine, the main bearings are used between the

1. connecting rod and the crankshaft
2. wrist pin and the connecting rod
3. camshaft and the engine block
4. crankshaft and the engine block

ANS.: D

73)  Heat exchangers are most commonly found in a small auxiliary diesel engine

1. fuel oil system
2. governing system
3. air starting system
4. lube oil system

ANS.: D

 74)  Multiple concentric valve springs are often used with diesel engine valves to

1. enable research and development of cam contour to be simplified
2. operate the valve gear where the larger force is required, but space limitations restrict use of a large spring
3. allow for easier valve replacement
4. enable a total smaller valve spring force to keep the valve tight on its seat

ANS.: B

 75)   Which of the listed bearing installations is subjected to swinging motion?

1. crankshaft journal
2. crankpin bearings
3. wrist pin bearings
4. thrust bearings

ANS.: C

76)   One advantage of vacuum feed type cylinder lubricators over the liquid sight type is-

1. there are fewer moving parts
2. adjustment is not required 
3. better metering accuracy
4. a lower grade of oil may be used

ANS.: C

77)   Cooling water pumps driven by direct reversing diesel engines are usually  of the straight  impeller vane type -pump with a concentric housing to

1. provide cooling water flow when the engine is running either ahead or aster
2. provide the greatest pump efficiency
3. prevent pump clogging from marine growth
4. prevent cavitation at the pump outlet

ANS.: A

78) Motor vessels usually have an independent lube oil system each for the main engine and main reduction gears because

1. coolers are not needed for the gear system
2. contaminants produced by the engine could harm the reduction gears
3. non additive oils are used in the main engine system
4. Different type centrifuges are required for the main engine and reduction gear lube systems

ANS.: B

79) Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?

1. Steel-lined
2. Poured babbitt, self-aligning
3. Split roller
4. Precision insert

ANS.: D

80) Directional intake ports in diesel engines are used to

1. reduce air charge turbulence
2. induce air swirl
3. deflect hot combustion gas away from the valves
4. oppose the effects of piston induced squish

ANS.: B