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Internal Combustion Engines

Internal Combustion Engines
In a diesel engine, the duration between the time of injection and ignition, is known as

Delay period
Burning period
Period of ignition
Pre-ignition period

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

Decrease
None of these
Remain same
Increase

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Internal Combustion Engines
A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

286 cm3
252 cm3
248 cm3
264 cm3

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Internal Combustion Engines
The knocking tendency in spark ignition engines may be decreased by

Controlling the exhaust temperature
Controlling the air-fuel mixture
Controlling the ignition timing
Reducing the compression ratio

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Internal Combustion Engines
If the intake air temperature of I.C. engine increases, its efficiency will

None of these
Remain same
Decrease
Increase

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Internal Combustion Engines
The theoretically correct air fuel ratio for petrol engine is of the order of

0.25069444444444
0.62569444444444
0.50069444444444
0.37569444444444

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