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Fuels and Combustion

Fuels and Combustion
L.D. converter gas (produced in steel plant) comprises mainly of

CO (upto 65%) & CO₂
CO & O₂
CO₂ & O₂
CO₂ & H₂

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Fuels and Combustion
Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.

1400
1250
1100
1350

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Fuels and Combustion
Coal is pulverised before burning in large capacity boiler furnaces mainly to

Provide trouble free operation
Enhance its calorific value
Ensure its complete combustion
Facilitate easy ash removal

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Fuels and Combustion
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.

1000
8000
6000
4000

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Fuels and Combustion
In flue gas analysis by Orsat's apparatus, carbon dioxide is absorbed by

Cuporus chloride
Potassium hydroxide
Alkaline pyragllol solution
Dilute potassium carbonate

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Fuels and Combustion
Softening temperature of coal ash is a measure of the __________ of coal.

Size stability
Caking tendency
Coking tendency
Clinkering tendency

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