Automobile Engineering in ME
Vulcanizing means

Melting rubber while stirring it
Heating rubber under pressure
None of the listed here
Spraying with special paint

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

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
Increase the speed at which the valves move up and down
Make the crankshaft turn smoothly

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