Internal Combustion Engines
Detonation is harmful due to

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

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Internal Combustion Engines
Supercharging is the process of

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Providing forced cooling air
Supplying compressed air to remove combustion products fully
Injecting excess fuel for raising more loads

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