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

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

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Act as a reservoir or stabilizer of electricity
Supply electricity to the alternator
Supply electricity to the vehicle's electrical system at all times while the engine is running
Supply a large amount of power to turn the starter motor when the engine is being started

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