Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Creates swirl
Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Increases the combustion temperature

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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
Removes impurities from cylinder head lubricating oil
None of these
Prevent engine oil from going into combustion chamber

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