Chemical Engineering - Furnace Technology

Exercise :: Furnace Technology - Section 2

31. 

Forced recirculation of furnace gases is practised

A. to increase heat transfer by convection.
B. to ensure uniform temperature.
C. in furnaces, operating below 750°C.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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32. 

Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the

A. quantity & temperature of waste gas.
B. dust concentration & nature of dust in waste gas.
C. corrosive nature of the waste gas.
D. all (a), (b) and (c).

Answer: Option B

Explanation:

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33. 

Air filtration in a furnace

A. reduces its thermal efficiency.
B. is indicated by flame sting out.
C. increases the flue gas temperature.
D. none of these.

Answer: Option A

Explanation:

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34. 

Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?

A. Ash disposal problem.
B. Excessive fly ash discharge from the stack.
C. Higher power consumption in its transportation.
D. Erosion of induced draft fan blades.

Answer: Option A

Explanation:

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35. 

Which of the following is a periodic furnace?

A. Tunnel kiln
B. Rotary kiln
C. Soaking pit
D. Reheating furnace.

Answer: Option C

Explanation:

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