Fuels and Combustion
A coal having high volatile matter content will

Give less yield of tar and gas on carbonisation
Burn with a small non-smoky flame
None of these
Have a very high calorific value

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Fuels and Combustion
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that

21% excess air has been used for combustion
21% excess oxygen has been used for combustion
No excess air has been used for combustion
Complete combustion of fuel has taken place

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Fuels and Combustion
The weathering index of a coal

Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency
Is a measure of its size stability, when stored & exposed to weather
Is related to its calorific value

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