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Fuels and Combustion

Fuels and Combustion
Coke oven gas burns with an yellowish flame, because of the presence of

CH₄
H₂
CO₂
NH₃

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Fuels and Combustion
Artificial draught produced by a fan can be controlled by the

Speed of the fan
All of these
Damper
Variation in the pitch of the fan blades

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Fuels and Combustion
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

10000
50
5000
1000

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Fuels and Combustion
The advantage of firing pulverised coal in the furnace lies in the fact, that it

Permits the use of high ash content coal
All of these
Accelerates the burning rate and economises on fuel combustion
Permits the use of low fusion point ash coal

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Fuels and Combustion
Mott and Wheeler test is conducted on coke to find its

Volatile matter content
Abradability
Reactivity with O₂
Phosphorus content

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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

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

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