Internal Combustion Engines
The compression ignition engines are governed by

Combination of (B) and (C)
Quantitative governing
Hit and miss governing
Qualitative governing

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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
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

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