Automobile Engineering in ME
The forced fed lubrication system means that the oil is delivered to the engine by

Splashing action of the crankshaft
None of these
The pressure created by the oil pump
Gravity

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

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

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