INTERNAL COMBUSTION ENGINES QUIZ

By higher octane number of spark ignition fuel, it is meant that the fuel has

Longer ignition delay

Higher heating value

Higher flash point

Lower volatility

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The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called

Efficiency ratio

Net efficiency

Relative efficiency

Overall efficiency

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Theoretically, a four stroke cycle engine should develop _________ power as that of a two stroke cycle engine.

Double

Same

Half

Four times

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The size of inlet valve of an engine in comparison to exhaust valve is

More

Same

Less

More/less depending on capacity of engine

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Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve closing before bottom dead center

Exhaust valve closing after top dead center

Inlet valve opening before top dead center

Inlet valve closing after bottom dead center

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The air requirement of a petrol engine during starting compared to theoretical air required for complete combustion is

More

Same

May be more or less depending on engine capacity

Less

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In a four stroke cycle petrol engine, the expansion

May start and end anywhere

Starts at 30° after top dead center and ends at 50° after bottom dead center

Starts at 30° before top dead center and ends at 50° before bottom dead center

Starts at top dead center and ends at bottom dead center

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The mean effective pressure obtained from engine indicator indicates the

Maximum pressure developed

Minimum pressure

Instantaneous pressure at any instant

Average pressure

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Which of the following medium is compressed in a Diesel engine cylinder?

Air alone

Fuel alone

Air and fuel

Air and lub oil

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In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.

None of these

Above

Below

Equal to

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