Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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

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

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