Internal Combustion Engines
Pick up the wrong statement about supercharging

Supercharging reduces knocking in diesel engines
Supercharging results in fuel economy
Supercharging at high altitudes is essential
There can be limited supercharging in petrol engines because of detonation

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Internal Combustion Engines
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

Flow is produced due to the static head in the float chamber
The diameter of the jet is constant and the discharge coefficient is invariant
The flow from the main jet is diverted to the compensating jet with increase in speed
Jet area is automatically varied depending on the suction

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