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

not listed here
opens at T.D.C. and closes at B.D.C.
opens at 10° after T.D.C. and closes at 20° before 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 makes petrol engines lighter
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance
It is just customary to have less compression ratio in petrol engines

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Automobile Engineering in ME
Which one of the following statements correctly describes the construction of a planetary gear type differential?

The internal gear is fixed to the planetary gear.
The six planetary pinions rotate in constant mesh with the internal gears.
One drive shaft is splined to the central gear and the other to the planetary gear.
Each planetary pinion gear meshes with both the central gear and the internal gear.

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