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Air fuel ratio for idling speed of a petrol engine is approximately

A.	1 : 1	B.	5 : 1
C.	10:1	D.	15 : 1

All heat engines utilize

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

An engine indicator is used to determine the following

A.	speed	B.	temperature
C.	volume of cylinder	D.	m.e.p. and I.H.P.

10.

Combustion in compression ignition engines is

A.	homogeneous	B.	heterogeneous
C.	both (a) and (b)	D.	laminar

11.

Crankcase explosion in I.C. engines usually occurs as

A.	first a mild explosion followed by a bi explosion	B.	first a big explosion followed by a mil explosion
C.	both mild and big explosions occi simultaneously	D.	never occurs

12.

Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided

A.	it is properly designed	B.	best quality fuel is used
C.	can not work as it is impossible	D.	flywheel size is proper

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