Automobile Engineering in ME
The two kinds of piston rings are

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

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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels
Distance between the centres of the front tyres
Extreme length of the vehicle
Distance between the centres of the rear tyres

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