INTERNAL COMBUSTION ENGINES QUIZ

Pick up the wrong statement about supercharging

There can be limited supercharging in petrol engines because of detonation

Supercharging reduces knocking in diesel engines

Supercharging results in fuel economy

Supercharging at high altitudes is essential

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The inlet valve of a four stroke cycle internal combustion engine remains open for

270Â°

180Â°

230Â°

130Â°

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If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

0.04

0.14

0.02

0.08

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The air standard efficiency of an I.C. engine depends on

Speed of engine

None of these

Fuel used

Compression ratio

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The higher combustion chamber wall temperature in compression ignition engines will _________ knocking tendency.

Not effect

Increase

Reduce

None of these

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

F.P. =

F.P. = I.P. -

F.P. = I.P./

P./I.P.

F.P. =

P.

P.

P. - I.P.

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The correct mixture strength (by weight) for petrol is about

22.6 : 1

18.5 : 1

14.6 : 1

20.4 : 1

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Supercharging is the process of supplying the intake air to the engine cylinder at a density ___ the density of the surrounding atmosphere.

Less than

Greater than

None of the listed here

Equal to

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A carburettor is used to supply

Petrol, air and lubricating oil

Air and diesel

Petrol and lubricating oil

Petrol and air

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Compression loss in I.C engines occurs due to

All of these

Leaking piston rings

Clogged air inlet slots

Use of thick head gasket

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