INTERNAL COMBUSTION ENGINES QUIZ

In a naturally aspirated diesel engine, the air is supplied by

A centrifugal blower

An injection tube

A supercharger

A vacuum chamber

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The increase of efficiency of a compression ignition engine, as the load decreases, is due to

Higher maximum temperature

Quantitative governing

Qualitative governing

Hit and miss governing

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The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will

May increase or decrease depending on other factors

Increase

Be independent

Decrease

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Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

To some extent

Unpredictable

Yes

No

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If the speed of the engine is increased, the indicated power will

Remain same

None of these

Decrease

Increase

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The knock in diesel engine occurs due to

Reduction of delay period

Instantaneous auto ignition of last part of charge

Delayed burning of the first part of the charge

Instantaneous and rapid burning of the first part of the charge

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The pressure at the end of compression, in diesel engines, is approximately

20 bar

35 bar

25 bar

10 bar

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The thermodynamic cycle on which the petrol engine works, is

Otto cycle

Rankine cycle

Stirling cycle

Joule cycle

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

None of these

Remain same

Increase

Decrease

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Compression loss in I.C engines occurs due to

Leaking piston rings

All of these

Clogged air inlet slots

Use of thick head gasket

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