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Internal Combustion Engines

Internal Combustion Engines
Iso-octane (C₈H₁₈) has octane number of

120
100
50
0

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Internal Combustion Engines
The actual volume of fresh charge admitted in 4-stroke petrol engine is

Equal to stroke volume and clearance volume
More than stroke volume
Equal to stroke volume
Less than stroke volume

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Internal Combustion Engines
The inlet value of a four stroke cycle I.C engine remains open for nearly

180°
200°
125°
235°

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Internal Combustion Engines
In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

End of suction stroke
Beginning of suction stroke
Beginning of exhaust stroke
End of exhaust stroke

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Internal Combustion Engines
Engine pistons are usually made of aluminium alloy because it

Is lighter
Wear is less
Is stronger
Absorbs shocks

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Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

It is properly designed
Best quality fuel is used
Flywheel size is proper
Cannot work as it is impossible

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