Fuels and Combustion
If oxygen content in the flue gas rises too high, fuel is being wasted by

Incomplete combustion
Moisture loss
Dry gas/stack gas loss
None of these

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Fuels and Combustion
Rate of low temperature oxidation of coal due to bad storage conditions

Is accelerated by storage in large heaps with small surface to volume ratio
Is more for low volatile coal compared to high volatile coal
Decreases with increase in surface area
Does not vary with increase in surface area

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Fuels and Combustion
Which of the following would require least amount of secondary air for combustion?

Anthracite containing 10% volatile matter and 8% ash
Bituminous coal containing 20% ash and 25% volatile matter
Coke breeze containing 25% ash and 2% volatile matter
Semi-bituminous coal containing 25% ash and 20% volatile matter

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