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

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

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Automobile Engineering in ME
The function of oil control rings is that it

Lubricates the cylinder wall by releasing oil from its hole
Maintains a seal and prevents escape of burned gases and oil leakage
Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

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