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Fuels and Combustion

Fuels and Combustion
Hard coke is manufactured from

Bituminous coal
Semi-anthracite
Anthracite
Lignite

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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

42.9
27.6
23
47.3

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Fuels and Combustion
Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?

Clarain
Vitrain
Durain
Fussain

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Fuels and Combustion
Naphthalene recovered from coke oven gas is used

As moth balls (insecticides)
For making electrodes
As a fuel in furnaces
As moisture proof coating on fibres

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Fuels and Combustion
For maximum discharge through a chimney, its height should be

Infinitely long
More than 105.7 metres
Equal to the height of the hot gas column producing draught
200 meters

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Fuels and Combustion
Volumetric ratio of N₂ to O₂ in dry atmospheric air is

0.79
3.76
0.21
4.76

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