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Internal Combustion Engines

Internal Combustion Engines
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - rγ - 1
1 - (1/rγ - 1)
1 + rγ - 1
None of these

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

270°
130°
180°
230°

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

Suction, compression, expansion and exhaust
Expansion, compression, suction and exhaust
Compression, expansion, suction and exhaust
Suction, expansion, compression and exhaust

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Internal Combustion Engines
In petrol engines, the delay period is of the order of

0.002 second
0.001 second
0.003 second
0.004 second

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Internal Combustion Engines
All heat engines utilize

Net calorific value of oil
High heat value of oil
Low heat value of oil
Calorific value of fuel

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

Remain same
None of these
Increase
Decrease

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