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

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

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

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