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Question
Detonation is harmful due to
Options:
A .  increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
B .  excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
C .  high intensity of knock causes crankshaft vibration and the engine runs rough
D .  none of the above
Answer: Option D
Answer: (d).none of the above

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