Automobile Engineering in ME
The effect of vapour locking on the brake performance is that the

Brakes function more effectively
Brakes fail completely
Vapour locking has no effect on brake performance
Brake operation is delayed after depression of the brake pedal

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Maintains a seal and prevents the fuel leakage
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Creates swirl
Increases the combustion temperature

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

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
Make the crankshaft turn smoothly

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