Internal Combustion Engines
The two reference fuels used for cetane rating are

Cetane and alpha-methyl naphthalene
Cetane and iso-octane
Cetane and tetra ethyl lead
Cetane and normal heptane

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Internal Combustion Engines
Supercharging is the process of

Injecting excess fuel for raising more loads
Supplying compressed air to remove combustion products fully
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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