Fuels and Combustion
The weathering index of a coal

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

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Fuels and Combustion
Pick out the wrong statement.

None of these
Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel
Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing

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