Automobile Engineering in ME
The two kinds of piston rings are

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

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the alternator
Supply electricity to the vehicle's electrical system at all times while the engine is running
Supply a large amount of power to turn the starter motor when the engine is being started
Act as a reservoir or stabilizer of electricity

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