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
Detonation is harmful due to

High intensity of knock causes crankshaft vibration and the engine runs rough
None of these
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

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