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 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

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It draws heat out of the engine compartment
It cools the engine by blowing air onto the cylinder block
It blows air through the radiator when necessary
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

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