Internal Combustion Engines
If petrol is used in a diesel engine, then

Efficiency will be low
Low power will be produced
Black smoke will be produced
Higher knocking will occur

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Internal Combustion Engines
Detonation is harmful due to

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

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