Automobile Engineering in ME
Wheel base of a vehicle is the

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

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Automobile Engineering in ME
It is necessary to maintain the valve clearances as they

Increase the speed at which the valves move up and down
Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly

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