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

Removes impurities from cylinder head lubricating oil
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
None of these

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Automobile Engineering in ME
The function of a second ring is that it is a

Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Cushion ring which prevents piston slap and knock
Back up compression ring which will work in place of the top ring when it is broken

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