Automobile Engineering in ME
The two kinds of piston rings are

Pressure and sealing rings
Compression and sliding seal rings
Compression and oil control rings
Oil scrapper and oil control rings

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

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