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Fuels and Combustion

Fuels and Combustion
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

1000
5000
10000
50

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Fuels and Combustion
Use of preheated air for combustion of fuel in the furnace, increases the

Flame temperature
Calorific value of the fuel
Scale losses of the furnace stock
None of these

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Fuels and Combustion
As the C/H ratio of the fuel increases, the amount of CO₂ formed on combustion __________ for the same percentage of excess air.

May increase or decrease depending on the type of fuel
Decreases
Increases
Remains same

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Fuels and Combustion
Ignition temperature decreases progressively from anthracite to lignite, because

Moisture content increases
Volatile matter content increases
Carbon content decreases
Ash content increases

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Fuels and Combustion
The function of secondary combustion air is to

Pneumatically convey the pulverised coal
Completely burn the volatile matter
None of these
Burn the lumpy coal

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Fuels and Combustion
About __________ Nm³ of air will be required for the complete combustion of 2Nm³ of CO.

3
2
1
5

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