Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

not listed here
opens at 10° after T.D.C. and closes at 20° before B.D.C.
opens at T.D.C. and closes at B.D.C.
opens at 20° before T.D.C. and closes at 35° after B.D.C.

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance
It makes petrol engines lighter

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Automobile Engineering in ME
Wheel base of a vehicle is the

Extreme length of the vehicle
Distance between the centres of the front tyres
Distance between the centres of the front and rear wheels
Distance between the centres of the rear tyres

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