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241.

LPG mainly consists of

A.	Methane and ethane	B.	Propane and butane
C.	Petrol and diesel	D.	Hexane and butadiene

242.

Gum content of petroleum fuels is mainly due to

A.	concentration of sulphides and disulphides	B.	evaporation loss of lighter fractions
C.	oxidation of unsaturated bydrocarbons	D.	All of the above

243.

CFR engine is a

A.	high speed engine	B.	multi-cylinder four stroke engine
C.	2 and 4 stroke engine	D.	variable compression ratio engine

244.

High gum content in petrol may result in

A.	detonation	B.	misfiring
C.	clogging of carburettor	D.	none of the above

245.

High sulphur content of petrol affects the engine performance by

A.	causing corrosion of muffler and exhaust pipe	B.	had odours
C.	poor explosion characteristics	D.	All of the above

246.

In triptane rating the non-knocking reference fuel is

A.	leaded 2,3,3 trimethyl butane	B.	isobutane, C4H10
C.	butadiene C4H6	D.	none of the above

247.

Quality of diesel oil can be expressed in terms of cetane number and also

A.	aniline point	B.	API gravity
C.	SAE number	D.	diesel index

248.

In a vehicle if there is no king pin offset

A.	Starting steering effort will be high	B.	Starting steering effort will be zero
C.	Wobbling of wheels will increase	D.	bracking effort will be high

249.

Fuel pump for diesel engine is

A.	electrically operated	B.	mechanically operated
C.	pneumatically operated	D.	electro-magnetically operated

250.

Which of the following is not incorporated in scooters?

A.	Air cleaner	B.	Muffler
C.	Fuel pump	D.	Fuel filter