Internal Combustion Engines
Detonation is harmful due to

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
None of these
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

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

All of these
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
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

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

All of these
Inject fuel at a high velocity to facilitate atomization
Inject fuel in a chamber of high pressure at the end of compression stroke
Ensure that penetration is not high

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