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19.

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

20.

Fuel oil consumption guarantees for I .C. engine are usually based on

A.	low heat value of oil	B.	high heat value of oil
C.	net calorific value of oil	D.	calorific value of fuel

21.

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

22.

If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be

A.	2%	B.	4%
C.	8%	D.	14%

23.

If the intake air temperature of I.C. engine increases, its efficiency will

A.	increase	B.	decrease
C.	remain same	D.	unpredictable

24.

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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