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Mechanical Engineering Objective Questions { Internal Combustion Engines }



50. A heat engine utilises the
A.Calorific value of oil
B.Low heat value of oil
C.High heat value of oil
D.Mean heat value of oil

51. Gaseous-fuel guarantees are based on
A.Calorific value of oil
B.Low heat value of oil
C.High heat value of oil
D.Mean heat value of oil

52. Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads
A.The friction is high
B.The friction is unpredictable
C.The small difference in cooling water temperature or in internal friction has a disproportionate effect
D.The engine is rarely operated

53. Polymerisation is a chemical process in which molecules of a compound become
A.Larger
B.Slowed down
C.Smaller
D.Liquid

54. The term scavenging is generally associated with
A.2-stroke cycle engines
B.High efficiency engines
C.Aeroplane engines
D.Diesel engines

55. In diesel engine, the compression ratio in comparison to expansion ratio is
A.Same
B.Less
C.More
D.Variable

56. The cam shaft of a four stroke LC. engine. running at 1500 rmp will run at
A.1500 rpm
B.750 rpm
C.3000 rpm
D.Any value independent of engine speed

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