Internal Combustion Engines
The fuel valve in a four stroke cycle diesel engine

Opens at 15° after top dead center and closes at 20° before bottom dead center
Opens at 15° before top dead center and closes at 20° after top dead center
May open and close anywhere
Opens at top dead center and closes at bottom dead center

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Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging at high altitudes is essential
Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy
There can be limited supercharging in petrol engines because of detonation

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
May open and close anywhere

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