Internal Combustion Engines
The function of a distributor in a coil ignition system of I.C. engines is

To distribute current
To distribute power
To distribute spark
To time the spark

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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
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
None of these
High intensity of knock causes crankshaft vibration and the engine runs rough

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