Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

It is properly designed
Cannot work as it is impossible
Flywheel size is proper
Best quality fuel is used

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Internal Combustion Engines
Supercharging is the process of

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

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