Internal Combustion Engines
Pick up the wrong statement about supercharging

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

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

All of these
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
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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