Fuels and Combustion
Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.

900-1000
1400-1500
400-500
1700-1800

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Fuels and Combustion
The weathering index of a coal

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

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