Fuels and Combustion
Supply of excess air for complete combustion of fuel is necessitated to facilitate

Its thorough mixing with air
Attainment of chemical equilibrium
None of these
Attainment of high temperature

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Fuels and Combustion
Bright coal

Contains more than 90% durain
Is non-coking
Contains more than 90% fussain
Contains mainly vitrain & clarain and is generally coking

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