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

Make the crankshaft turn smoothly
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

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Improve the force transmission speed
Reduce the amount of sliding resistance
Can deal with movement of the suspension both vertically and in other directions
Reduce the amount of noise generated

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Automobile Engineering in ME
In bias ply tyres

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

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