Automobile Engineering in ME
The two kinds of piston rings are

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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Delivers improved cornering on dry road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces

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