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Mechanical Engineering Objective Questions { Internal Combustion Engines }



22. Combustion in compression ignition engines is
A.Homogeneous
B.Heterogeneous
C.Both (A) and (B)
D.Laminar

23. The temperature of interior surface of cylinder wall in nonnal operation is not allowed to exceed
A.80C
B.120C
C.180C
D.240C

24. Crankcase explosion in I.C. engines usually occurs as
A.First a mild explosion followed by a big explosion
B.First a big explosion followed by a mild explosion
C.Both mild and big explosions occur simultaneously
D.Never occurs

25. Compression loss in I.C. engines occurs due to
A.Leaking piston rings
B.Clogged air-inlet slots
C.Increase in clearance volume caused by bearing-bushing wear
D.All of the above

26. The specific fuel consumption per BHP hour for a petrol engine is approximately
A.0.15 kg
B.0.20 kg
C.0.25 kg
D.0.30 kg

27. The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is
A.More
B.Loss
C.Same
D.May be more or less depending on engine capacity

28. The inlet value of a four stroke cycle I.C. engine remains open for nearly
A.180
B.125
C.235
D.200

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