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

None of these
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

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Promotes combustion by creating a swirling movement in the air-fuel mixture
Mixes fuel with air
Feeds blow by gases to the exhaust manifold
Returns blow by gases from the crankcase to the intake system

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