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Fuels and Combustion

Fuels and Combustion
Most of the coking coals are

Anthracite
Lignite
Bituminous
None of these

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Fuels and Combustion
Water gas constitutes mainly of

CO₂ & H₂
CO & H₂
CO & N₂
CH₄ & H₂

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Fuels and Combustion
In Lurgi coal gasifier,

Entrainment of solids is higher
Low carbon conversion efficiency is achieved
Larger quantity of coal can be processed
Coking coals cannot be used

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Fuels and Combustion
With increase in the oxygen content of the coal, its __________ decreases.

Caking power
Both A & B
Calorific value
Neither A nor B

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Fuels and Combustion
Which of the following is the most reactive (as regards the formation of CO + H₂ from C + H₂O) ?

Blast furnace coke
Anthracite coal
Low temperature coke
Sub-bituminous coal

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Fuels and Combustion
Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

Requirement of large volume combustion chamber
Chances of clinker formation
Risk of explosion
Incomplete combustion of coal

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