Fuels and Combustion
The weathering index of a coal

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

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Fuels and Combustion
Orsat apparatus is meant for

Gravimetric analysis of flue gas
Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
None of these
Finding out combustion efficiency

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