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331.

Which one of the followings is used in S.I. engines?

A.	spark plug	B.	injector
C.	cross-head	D.	none of the above

332.

In actual practice, the inlet value of a four stroke I.C. engine should open

A.	exactly at the start of suction stroke	B.	slightly after the start of suction stroke
C.	slightly before the start of the suction stroke	D.	none of the above

333.

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the cylinder from the crank-case, is known as

A.	cleaning	B.	priming
C.	scavenging	D.	none of the above

334.

Petrol engines are also known as

A.	S.I. Engines	B.	C.I. Engines
C.	Steam Engines	D.	none of the above

335.

The ignition of the charge in spark ignition engine before spark occurs in spark plug, is known as

A.	auto-ignition	B.	pre-ignition
C.	detonation	D.	none of the above

336.

Which one of the following is a correct statement

A.	the exhaust valve of a four stoke I.C. engine should open exactly at the end of expansion stroke	B.	in actual practice, inlet valve of a four stroke I.C. engine should open exactly at the start of suction stroke
C.	the inlet valve remains open approximately for 180?	D.	valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously

337.

The exhaust value of a four stroke I.C. engine should open

A.	exactly at the end of expansion stroke	B.	slightly after the end of expansion stroke
C.	slightly before the end of expansion stroke	D.	none of the above

338.

The knocking in C.I. engine can be prevented if the first element of the fuel and air is having

A.	low density	B.	medium density
C.	high density	D.	none of the above

339.

The air gap between the central electrode and ground electrode of a spark plug is approximately

A.	1 cm	B.	0.5 cm
C.	0.2 cm	D.	0.1 cm to 0.06 cm

340.

The knocking in S.I. engines is characterised by sudden auto-ignition of the change

A.	nearest to the spark plug	B.	farthest away from the spark plug
C.	in the middle from the spark plug	D.	none of the above