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Fuels and Combustion

Fuels and Combustion
Coal containing large quantity of __________ are difficult to wash.

Ash
Free impurities
Inherent mineral matter
Volatile matter

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

Cuporus chloride
Alkaline pyragllol solution
Potassium hydroxide
Dilute potassium carbonate

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Fuels and Combustion
Moisture loss is determined by the

Both A and B
Moisture content of fuel
The water formed by combustion reaction
Humidity of combustion air

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Fuels and Combustion
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

M = 1.1 A
M = A
M = 1.8 A
M = 0.5 A

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Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

None of these
Lower carbon dioxide content
Higher carbon monoxide content
Higher methane content and thus higher calorific value

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Fuels and Combustion
The main advantage of forced draft over natural draft is that

All of these
Furnace control is easier
Smaller height chimney can be used
Combustion of fuel is complete

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