Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

None of these
Prevent sparking across the gap between the points
Both (A) and (B)
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit

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Internal Combustion Engines
Detonation is harmful due to

None of these
High intensity of knock causes crankshaft vibration and the engine runs rough
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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