Automobile Engineering in ME
The function of an alternator in an automobile is to

Supply electric power
Partly converts engine power into electric power
Continually recharges the battery
Converts mechanical energy into electrical energy

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

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

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