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Fuels and Combustion

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

42.9
27.6
47.3
23

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Fuels and Combustion
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?

Flame temperature achieved
Speed of combustion of fuel
Heat transfer rate to the stock in the furnace
Calorific value of the fuel

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Fuels and Combustion
Percentage of methane in coke oven gas may be around

50
5
25
15

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

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

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Fuels and Combustion
The pyragallol solution used in orsat apparatus can absorb

All of these
Only O₂
Both O₂ and CO₂
Both O₂ and CO

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Fuels and Combustion
Which of the following gaseous fuels has the lowest calorific value?

Blast furnace gas
Gobar gas
Refinery gas
Converter gas

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