INTERNAL COMBUSTION ENGINES QUIZ

A heat engine utilizes the

Calorific value of oil

Mean heat value of oil

High heat value of oil

Low heat value of

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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

0.08

0.14

0.02

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The object of providing masked inlet valve in the air passage of compression ignition engines is to

Induce secondary turbulence

Control air flow

Induce primary swirl

Enhance flow rate

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In a four stroke cycle petrol engine, the expansion

Starts at 30° before top dead center and ends at 50° before bottom dead center

Starts at 30° after top dead center and ends at 50° after bottom dead center

May start and end anywhere

Starts at top dead center and ends at bottom dead center

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In loop scavenging, the top of the piston is

Flat

Depressed

Contoured

Slanted

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The fuel in diesel engine is normally injected at pressure of

90-130 kg/cmÂ²

60-80 kg/cmÂ²

5-10 kg/cmÂ²

20-25 kg/cmÂ²

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

Fuel used

Compression ratio

Speed of engine

None of these

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Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve opening before top dead center

Inlet valve closing after bottom dead center

Inlet valve closing before bottom dead center

Exhaust valve closing after top dead center

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In a four stroke cycle engine, the sequence of operations is

Compression, expansion, suction and exhaust

Suction, expansion, compression and exhaust

Expansion, compression, suction and exhaust

Suction, compression, expansion and exhaust

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

Increase up to certain limit and then decrease

Increase

Remain same

Decrease

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