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
Allow for lengthening of the valves owing to the heat of combustion
Make the crankshaft turn smoothly
Reduce the resistance to sliding that occurs between the cam and the tappet

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Automobile Engineering in ME
In bias ply tyres

All plies run parallel to one another
All of these
Belts of steel mesh are used in the tyres
One ply layer runs diagonally one way and another layer runs diagonally the other way

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