Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve closing after bottom dead center
Exhaust valve closing after top dead center
Inlet valve closing before bottom dead center
Inlet valve opening before top dead center

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