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Fuels and Combustion

Fuels and Combustion
Which of the following has the highest heat of combustion?

H₂
CO
C₂H₆
CH₄

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

Refinery gas
Converter gas
Blast furnace gas
Gobar gas

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Fuels and Combustion
High rate of heating of coke ovens

May damage its walls due to abrupt excessive swelling of coal
None of these
Produces larger size coke
Increases the time of carbonisation

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Fuels and Combustion
Caking coal is desirable for

Burning on firebars
All of these
Burning on travelling grate
Coke making

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Fuels and Combustion
Gray King Assay and Swelling Index of a coal is a measure of its

Abradability
Resistance to impact breakage
Swelling characteristics
Agglutinating properties

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Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Caking index
Yield of carbonised products
Calorific value
Friability & oxygen content

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