INTERNAL COMBUSTION ENGINES QUIZ

It the temperature of intake air in IC engines is lowered, then its efficiency will

Decrease

Increase up to certain limit and then decrease

Increase

Remain same

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The minimum cranking speed in case of petrol engine is about

60 - 80 rpm

One fourth of operating speed

250 - 300 rpm

Half the operating speed

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The mean effective pressure obtained from engine indicator indicates the

Minimum pressure

Maximum pressure developed

Instantaneous pressure at any instant

Average pressure

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The ignition quality of petrol is expressed by

All of these

Calorific value

Octane number

Cetane number

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For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.75069444444444

0.50069444444444

0.62569444444444

0.37569444444444

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Which of the following is not an internâ€™s combustion engine?

Steam turbine

2-stroke petrol engine

4-stroke petrol engine

Diesel engine

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The inlet value of a four stroke cycle I.C engine remains open for nearly

125Â°

180Â°

235Â°

200Â°

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Number of working strokes per min. for a two stroke cycle engine is ____ the speed of the engine in r.p.m.

Four-times

Equal to

Twice

One-half

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The turbine of the turboprop engine is ___ that of the turbojet engine.

None of the listed here

Bigger than

Smaller than

Same as

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The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - rγ - 1

1 + rγ - 1

1 - (1/rγ - 1)

None of these

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