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Fuels and Combustion

Fuels and Combustion
Flue gas from the heating chamber of byproduct coke ovens is removed by

Induced draft fan
Steam ejector
Natural draft
Forced draft fan

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Fuels and Combustion
Calorific value of tar is about __________ Kcal/kg.

5000
12000
8800
16000

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Fuels and Combustion
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Decreases
May increase or decrease, depends on combustibles
Increases
Remains constant

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Fuels and Combustion
Blast furnace gas burns with a bluish flame, because of the presence of

CO
S
CH₄
CO₂

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Fuels and Combustion
The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be

47.3
42.9
23
27.6

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Fuels and Combustion
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1400
1100
1250
1350

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