Fuels and Combustion
Which of the following accounts for maximum energy loss in a boiler?

Unburnt carbon in flue gases
Flue gases
Ash content in the fuel
Incomplete combustion

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

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

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

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

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