INTERNAL COMBUSTION ENGINES QUIZ

The advancing of spark timing in spark ignition engines will ___ knocking tendency.

Increase

None of the listed here

Not effect

Reduce

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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.

Below

None of these

Equal to

Above

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If the compression ratio in I.C. engine increases, then its thermal efficiency will

None of these

Increase

Remain same

Decrease

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

Heating incoming air

Supercharging

Scavenging

Feeding more fuel

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A spark plug gap is kept from

0.6 to 1.0 mm

0.4 to 0.9 mm

0.2 to 0.8 mm

0.3 to 0.7 mm

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The Cipoletti weir is a __________ weir.

Triangular

Trapezoidal

Rectangular

Circular

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

Very low

Low

Very high

High

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A diesel engine as compared to petrol engine (both running and rated load) is

Less efficient

Other factors will decide it

Equally efficient

More efficient

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A higher compression ratio causes

Any one of these

Increase in detonation

Pre-ignition

Acceleration in the rate of combustion

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Volatility of diesel fuel oil is

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

It catches fire without external aid

Temperature at which it solidifies or congeals

Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

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