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37.

Scavenging is usually done to increase

A.	thermal efficiency	B.	speed
C.	power output	D.	fuel consumption

38.

Supercharging is essential in

A.	diesel engines	B.	gas turbines
C.	petrol engines	D.	aircraft engines

39.

The accunmulation of carbon in a cylinder results in increase of

A.	clearance volume	B.	volumetric efficiency
C.	ignition time	D.	effective compression ratio

40.

The actual volume of fresh charge admitted in 4-stroke petrol engine is

A.	equal to stroke volume	B.	equal to stroke volume and clearance volume
C.	less than stroke volume	D.	more than stroke volume

41.

The air requirement of a petrol engine during starting compared to theoretical required for complete combustion is

A.	more	B.	loss
C.	same	D.	may be more or less depending on engine capacity

42.

The air-fuel ratio of the petrol engine is controlled by

A.	fuel pump	B.	governor
C.	injector	D.	carburettor

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