Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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Internal Combustion Engines
Scavenging air in diesel engine means

Air used for combustion sent under pressure
Forced air for cooling cylinder
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Burnt air containing products of combustion

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

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

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