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281.

Purpose of cooling:

A.	To maintain the optimum temperature of engine	B.	To dissipate surplus heat for protection
C.	To maintain the lubricating property of oil	D.	All are correct

282.

Air-cooled engine has:

A.	Radiator	B.	Water jacket
C.	Fins	D.	None of these

283.

Air cooling system is generally found in:

A.	Single-cylinder engines	B.	Multi-cylinder engines
C.	Both (a) & (b)	D.	None of these

284.

In the air-cooled engines, cylinder normally enclosed in a sheet metal casing is called:

A.	Cowling	B.	Pre-combustion chamber
C.	Fins	D.	None of these

285.

A disadvantage of air-cooling system is:

A.	Uneven cooling of engine parts	B.	Engine temperature is high
C.	Both (a) & (b)	D.	None of these

286.

The fan of radiator is driven with the help of:

A.	V-belt	B.	Flat belt
C.	Chain sprocket	D.	Gear

287.

The fan of radiator is driven by:

A.	Camshaft	B.	Crankshaft
C.	Flywheel	D.	All are correct

288.

In water-cooled engines the water pump used:

A.	Centrifugal type	B.	Submersible type
C.	Both (a) & (b)	D.	None of these

289.

In water-cooled engines, water pump is connected with:

A.	Radiator	B.	Flywheel
C.	Fins	D.	Combustion chamber

290.

In radiator, hot water flows at the:

A.	Top	B.	Bottom
C.	Middle	D.	None of these