Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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Internal Combustion Engines
Detonation is harmful due to

Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
High intensity of knock causes crankshaft vibration and the engine runs rough
None of these

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