INTERNAL COMBUSTION ENGINES QUIZ

The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

Volumetric efficiency

Overall efficiency

Mechanical efficiency

Relative efficiency

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The cam shaft of a four stroke I.C. engine running at 1500 rpm will run at

750 rpm

3000 rpm

1500 rpm

Any value independent of engine speed

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The specific fuel consumption per BH hour for a petrol engine is approximately

0.25 kg

0.2 kg

0.15 kg

0.3 kg

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

F.P. = I.P. -

F.P. = I.P./

P./I.P.

P.

P. - I.P.

F.P. =

F.P. =

P.

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The minimum cranking speed in case of petrol engine is about

One fourth of operating speed

250 - 300 rpm

60 - 80 rpm

Half the operating speed

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The working pressure and temperature inside the cylinder of an internal combustion engine is _________ as compared to a steam engine.

Low

Very high

Very low

High

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Stoichiometric ratio is

Chemically correct air-fuel ratio by volume

None of these

Chemically correct air-fuel ratio by weight

Actual air-fuel ratio for maximum efficiency

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The output of a diesel engine can be increased without increasing the engine revolution or size in following way

Scavenging

Supercharging

Heating incoming air

Feeding more fuel

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The basic requirement of a good combustion chamber is

Low compression ratio

High thermal efficiency and power output

Minimum turbulence

Low volumetric efficiency

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The thermal efficiency of a petrol engine is _________ as compared to diesel engine.

More

Less

None of these

Same

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