INTERNAL COMBUSTION ENGINES QUIZ

Air fuel ratio at which a petrol engine cannot work is

20 : 1 and less

0.41736111111111

0.33402777777778

0.62569444444444

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The knocking in diesel engines may be prevented by

Increasing the inlet pressure of air

All of these

Raising the compression ratio

Reducing the delay period

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The specific fuel consumption per BHP hour for diesel engine is approximately

0.2 kg

0.15 kg

0.3 kg

0.25 kg

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The fuels in order of decreasing knock tendency for spark ignition engines are

Napthene, aromatics, paraffin

Paraffin, aromatic, napthene

Napthene, paraffin, aromatic

Paraffin, napthene, aromatic

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The Cipoletti weir is a __________ weir.

Rectangular

Triangular

Circular

Trapezoidal

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In a cycle, the spark lasts roughly for

0.1 sec

0.001 sec

1 sec

0.01 sec

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The pressure and temperature at the end of compression stroke in a petrol engine are of the order of

20-30 kg/cmÂ² and 450-500Â°C

4-6 kg/cmÂ² and 200-250Â°C

6-12 kg/cmÂ² and 250-350Â°C

12-20 kg/cmÂ² and 350-450Â°C

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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 - (1/rγ - 1)

1 - rγ - 1

1 + rγ - 1

None of these

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

Relative efficiency

Overall efficiency

Efficiency ratio

Net efficiency

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

Feeding more fuel

Scavenging

Heating incoming air

Supercharging

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