INTERNAL COMBUSTION ENGINES QUIZ

In the crankcase method of scavenging, the air pressure is produced by

Natural aspirator

Supercharger

Centrifugal pump

Movement of engine piston

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YOUR ANSWER : ?

When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

Centre of buoyancy

Centre of pressure

Centre of gravity

Metacentre

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If the speed of the engine is increased, the indicated power will

Remain same

None of these

Decrease

Increase

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When crude oil is heated, then which of the following hydrocarbon is given off first?

Gasoline

Natural gas

Paraffin

Kerosene

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The ratio of the indicated thermal efficiency to the air standard efficiency is known as

Volumetric efficiency

Overall efficiency

Relative efficiency

Mechanical efficiency

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The increase of efficiency of a compression ignition engine, as the load decreases, is due to

Hit and miss governing

Qualitative governing

Higher maximum temperature

Quantitative governing

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Compression ratio of I.C. Engines is

Swept volume/cylinder volume

Volume displaced by piston per stroke and clearance volume in cylinder

The ratio of volumes of air in cylinder before compression stroke and after compression stroke

Ratio of pressure after compression and before compression

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A fuel of an octane number rating of 75 matches in knocking intensity as a mixture of

75% normal heptane and 25% iso-octane

75% iso-octane and 25% normal heptane

75% petrol and 25% diesel

75% diesel and 25% petrol

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The fuel valve in a four stroke cycle diesel engine

Opens at top dead center and closes at bottom dead center

Opens at 15° before top dead center and closes at 20° after top dead center

May open and close anywhere

Opens at 15° after top dead center and closes at 20° before bottom dead center

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YOUR ANSWER : ?

The frictional power (F.P.) is given by

F.P. =

F.P. = I.P. -

P.

F.P. = I.P./

P./I.P.

P. - I.P.

P.

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