Chemical Engineering - Fuels and Combustion

16. 

Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?

A. Multicyclones
B. Bag filter
C. Wet scrubber
D. Hydrocyclones.

Answer: Option B

Explanation:

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17. 

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

A. less air for combustion.
B. correct amount of air for combustion.
C. too much air for combustion.
D. pulverised coal in boilers.

Answer: Option C

Explanation:

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18. 

Pick out the wrong statement.:

A. Carburetted water gas is also called blue gas.
B. Coals are divided in four species according to their carbon content in Seylor's classification.
C. Carbonisation time in a by-product coke oven is about 16 hours.
D. Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons.

Answer: Option A

Explanation:

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19. 

A good metallurgical coke should have very low

A. sulphur & phosphorous content
B. porosity
C. fusion point of its ash
D. hardness & strength

Answer: Option A

Explanation:

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20. 

Cannel coal

A. is non-coking.
B. has a high volatile matter content and burns with a luminous smoky flame.
C. is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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