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

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Internal Combustion Engines
Which of the following statement is correct regarding petrol engines?

The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
All of these
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition

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