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

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

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Internal Combustion Engines
Supercharging is the process of

Providing forced cooling air
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

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