Fuels and Combustion
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

Coke oven gas
Pulverised coke
Tar
Pitch

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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 a measure of its caking tendency
Gives an idea of the fusion temperature of ash
Is related to its calorific value

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