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Fuels and Combustion

Fuels and Combustion
Yield of pitch from distillation of high temperature tar is around __________ percent.

25
10
90
65

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

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Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

77
29
79
21

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Fuels and Combustion
The reaction, C + CO₂ ⟷ 2CO, taking place during coal gasification is called the __________ reaction. n.

Neumann reversal
Reduction
Shift conversion
Boudouard

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Fuels and Combustion
Preheating of __________ the flame temperature.

Either the fuel or the air or both, increases
The gaseous fuel before combustion decreases
Either the fuel or the air does not affect
Combustion air decreases

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Fuels and Combustion
In high temperature carbonisation (as compared to low temperature carbonisation) of coal

Coke oven gas yield is more
All of these
Calorific value of coke oven gas is less
Tar yield is less but free carbon in tar is more

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