Fuels and Combustion
Actual flame temperature is always lower than the adiabatic flame temperature, because there is

Both A & B
No possibility of obtaining complete combustion at high temperature
Neither A nor B
Always loss of heat from the flame

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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 related to its calorific value
Is a measure of its size stability, when stored & exposed to weather

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