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

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

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Fuels and Combustion
Washing of coal

Reduces its sulphur and ash content
Controls its ash fusibility and increases its calorific value
All of these
Improves its coking properties

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