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

Back up compression ring which will work in place of the top ring when it is broken
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
Compression ring and aids the top ring in sealing and cooling

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Automobile Engineering in ME
The lubrication oil flow in an engine is in the order as

Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan
Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan
Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan

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