Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 2

46. 

Thermal efficiency of furnaces can be improved by

A. waste heat recovery from flue gas.
B. minimising heat losses from furnace walls.
C. maintaining proper draught.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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47. 

Shaft furnaces are used for

A. smelting
B. calcining
C. roasting
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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48. 

Hearth furnaces are not used for

A. roasting
B. melting
C. reheating
D. none of these

Answer: Option D

Explanation:

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49. 

Turn down ratio of a burner

A. should be as low as possible i.e., 1 : 2.
B. should be 1:1 for a batch type furnace..
C. is the ratio of maximum to minimum permissible heat input rates.
D. is normally much more for a continuous furnace as compared to a batch furnace.

Answer: Option C

Explanation:

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50. 

Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?

A. Economiser.
B. Regenerator.
C. Ceramic recuperator.
D. Waste heat boiler.

Answer: Option B

Explanation:

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