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

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

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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

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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

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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

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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

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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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