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

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Increases the combustion temperature
Maintains a seal and prevents the fuel leakage
Creates swirl
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

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