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Fuels and Combustion

Fuels and Combustion
Which of the following is not a by-product fuel?

Petrol
Pitch
Refinery gas
Blast furnace gas

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

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

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Fuels and Combustion
Function of secondary air in pulverised coal firing is to

Reduce primary air requirement
Transport the coal to the burner
Dry the coal
Ensure efficient burning of coal around the burner

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Fuels and Combustion
Which of the following has the highest gross calorific value?

Coke oven gas
Carburetted water gas
Oil refinery gas
Blast furnace gas

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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
27.6
23
42.9

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Fuels and Combustion
Coal tar fuel - 200 (CTF 200) is a mixture of

Light oil and pitch
Anthracene and crecosote oil
Pitch and creosote oil
Solar oil and pitch

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