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

Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust 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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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression
Ignition induced to supplement the process of normal combustion
Ignition induced by the passage of a spark
Ignition of the charge before the passage of flame front

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