Automobile Engineering in ME
The purpose of a cylinder head gasket is to

Prevent engine oil from going into combustion chamber
Removes impurities from cylinder head lubricating oil
Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head
None of these

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

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