Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Exactly at the T.D.C. position on its compression stroke
Approaching the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke

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

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