Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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

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