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

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

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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
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

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