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Fuels and Combustion

Fuels and Combustion
Oxygen percentage (by weight) in atmospheric air is

23
29
21
19

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Fuels and Combustion
'Wobbe index' is a characteristic of

Solid fuels
Fat coals
Liquid fuels
Gaseous fuels

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

CO
CH₄
CO₂
S

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Fuels and Combustion
Coke oven gas is stripped of its H₂S and mercaptans content by

Adsorption on silica gel
Absorption in wash oil
Bubbling it through dilute sulphuric acid
Adsorption on bog iron bed

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Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

21
29
77
79

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Fuels and Combustion
Washing of coal decreases its

Both B and C
Caking index
Mineral matter content
Ash content

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