Internal Combustion Engines
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be

Lower
Higher
Remain unaffected
None of the listed here

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Internal Combustion Engines
Supercharging is the process of

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
Injecting excess fuel for raising more loads
Supplying compressed air to remove combustion products fully
Providing forced cooling air

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