Automobile Engineering in ME
The diagram which shows the correct crank positions corresponding to the opening and closing of the valves, is known as

None of these
Indicator diagram
Axial force diagram
Valve timing diagram

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

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