Chemical Engineering - Fuels and Combustion

21. 

A coal having high amount of volatile matter

A. would require smaller combustion chamber.
B. produces very little of tar and gas on carbonisation.
C. ignites easily and burns with long smoky flame.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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22. 

Carbon Content by weight in air dried wood may be about __________ percent.

A. 10
B. 25
C. 50
D. 80

Answer: Option C

Explanation:

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23. 

Which of the following accentuates clinker-ing trouble on furnace grate burning coal ?

A. Low reactivity of carbonised residue containing high proportions of iron & sulphur.
B. Low forced draught and fuel bed temperature.
C. Thick fire bed and preheated primary air.
D. All (a), (b) and (c).

Answer: Option D

Explanation:

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24. 

Natural draught produced by a chimney depends upon the

A. density of the chimney gases.
B. height of the chimney.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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25. 

Gross & net calorific value is the same for

A. blast furnace gas
B. coke oven gas
C. L.D. converter gas
D. none of these

Answer: Option C

Explanation:

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