Chemical Engineering - Fuels and Combustion

31. 

A sample of natural gas containing 80% methane (CH4) and rest nitrogen (N2) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the reminder going to CO, the Orsat analysis in volume percent is

A. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

Answer: Option B

Explanation:

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32. 

Which of the following would require maximum amount of % excess air for complete combustion ?

A. Coke oven gas
B. Furnace oil
C. Pulverised coal
D. Lump coal (fixed on chain grate).

Answer: Option D

Explanation:

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33. 

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

A. incomplete combustion.
B. complete combustion.
C. high oxygen in flue gas.
D. none of these.

Answer: Option B

Explanation:

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34. 

Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain

A. CO
B. CO2
C. H2O
D. both(b) & (c)

Answer: Option D

Explanation:

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35. 

Low temperature oxidation of coal is accelerated by the

A. storage in large heaps.
B. storage in compressed piles.
C. absence of porous or friable particles.
D. all (a), (b) and (c).

Answer: Option A

Explanation:

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