Automobile Engineering in ME
In radial tyres

All plies run parallel to one another and vertical to tyre bead
None of these
Inner tubes are always used
One ply layer runs diagonally one way and another layer runs diagonally the other way

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

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

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