Chemical Engineering - Fuels and Combustion

26. 

Use of pulverised coal in boiler furnace provides

A. high calorific value.
B. better combustion.
C. smokeless burning.
D. less erosion on furnace walls.

Answer: Option B

Explanation:

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27. 

Deficiency of combustion air during combustion of a gaseous fuel

A. lengthens the flame.
B. causes heat loss of fuel by its partial combustion.
C. both (a) & (b).
D. shortens the flame.

Answer: Option C

Explanation:

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28. 

Froth floatation is used for

A. washing fine coal dust (< 0.5 mm size).
B. washing lump coal (> 80 mm size).
C. removing ash from the coal based on difference in specific gravity of coal and ash.
D. all (a), (b)and(c).

Answer: Option A

Explanation:

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29. 

(64-132) rank coal (ASTM) means a coal with 64%

A. fixed carbon and having a heat value of 13, 200 BTU/1b.
B. ash and a heating value of 13, 200 BTU/1b.
C. fixed carbon and a heating value of 132 BTU/1b.
D. none of these.

Answer: Option A

Explanation:

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30. 

The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

A. CO2, O2, CO
B. CO, O2, CO2
C. CO2, CO, O2
D. O2, CO2, CO

Answer: Option A

Explanation:

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