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Fuels and Combustion

Fuels and Combustion
Percentage of carbon monoxide in blast furnace gas may be around

52
14
22
8

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Fuels and Combustion
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

GCV at constant volume
NCV at constant volume
GCV at constant pressure
NCV at constant pressure

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Fuels and Combustion
In general, the limit of inflammability/explosion limit of fuel gases is widened by the

Use of pure oxygen for combustion instead of air
All of these
Increase in gas pressure
Increase in temperature (i.e. preheating)

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Fuels and Combustion
With increase in moisture content of coal, its

Bulk density always decreases
Calorific value increases sometimes
Clinkering tendency during combustion increases
None of these

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

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

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Fuels and Combustion
A coal having higher volatile matter content will necessarily have lower

Calorific value
Ignition temperature
Caking index
Ash fusion temperature

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