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Mechanical Engineering Objective Questions { Internal Combustion Engines }

57. Engine pistons are usually made of, aluminium alloy because it
A.Is lighter
B.Wears less
C.Absorbs shocks
D.Is stronger

58. Most high speed compression engines operate on
A.Otto cycle
B.Diesel cycle
C.Dual cycle
D.Carnot cycle

59. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is
D.Less or more depending on operating conditions

60. A diesel engine as compared to petrol engine (both running at rated load) is -
A.More efficient
B.Less efficient
C.Equally efficient

61. The size of inlet valve of an engine in comparison to exhaust valve is
D.More/less depending on capacity of engine

62. In a typical medium speed, 4 stroke cycle diesel engine
A.Expansion starts at 20 after top dead centre and ends at 35 before bottom dead centre
B.Expansion starts at top dead centre and ends just after bottom dead centre
C.Expansion starts just before top dead centre and ends just after bottom dead centre
D.May start and end anywhere

63. In a cycle the spark lasts roughly for
A.1 sec
B.0.1 sec
C.0.01 sec
D.0.001 sec

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