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Fuels and Combustion

Fuels and Combustion
Which is the most matured coal?

Lignite
Anthracite
Semi-anthracite
Bituminous

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Fuels and Combustion
Higher fuel combustion efficiency can not be achieved by

Adopting proper fuel firing technique & fuel preparation
Supplying correct amount of combustion air
Reducing sulphur content in the fuel
Preheating of fuel gases & combustion air

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Fuels and Combustion
Narrow coke ovens as compared to wider coke ovens

Require less time of carbonisation
All of these
Produce stronger coke
Produce smaller coke

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Fuels and Combustion
With increase in C/H ratio of a fuel, the amount of CO₂ formed on its complete combustion

Either A or B, depends on other factors
Decreases
Increases
Remains same

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Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

4
20
40
96

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Fuels and Combustion
__________ present in coal is not determined in its ultimate analysis.

Hydrogen
Total carbon
Nitrogen
Fixed carbon

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