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- Question
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
Options- A. 20
- B. 40
- C. 60
- D. 80
- Correct Answer
- 80
- 1. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
Options- A. graphite powder
- B. thoria
- C. zircon powder
- D. beryllium Discuss
- 2. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
Options- A. preheating the combustion air.
- B. oxygen enrichment of combustion air.
- C. preheating the fuel gas.
- D. all (a), (b) & (c). Discuss
- 3. Cement Kiln is a
Options- A. rotary Kiln
- B. tunnel Kiln
- C. natural draft furnace
- D. batch furnace Discuss
- 4. The amount of combustible escaping uncon-sumed from the furnace, depends upon the
Options- A. air supplied and furnace temperature.
- B. burner design (thoroughness of mixing versus stratification).
- C. air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction).
- D. all (a), (b) and (c). Discuss
- 5. Regenerators are installed in
Options- A. coke ovens
- B. open hearth furnace
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 6. Power required in case of forced draught as compared to induced draught (for the same draught produced) is
Options- A. same
- B. less
- C. more
- D. either more or less; depends on the flue gas density Discuss
- 7. Which of the following is not a directly fired furnace?
Options- A. By-product coke oven
- B. Calcination kiln
- C. Sintering furnace
- D. Open hearth furnace Discuss
- 8. The heat recoverable from flue gases of furnaces depends on the
Options- A. thermal efficiency of furnace.
- B. quantity of flue gases.
- C. flue gas temperature drop through the furnace.
- D. all (a), (b) and (c). Discuss
- 9. Maximum heat transfer in high temperature furnaces is by
Options- A. conduction
- B. convection
- C. radiation
- D. either (a), (b) or (c); depends on the type of furnace Discuss
- 10. To reduce the stack loss, heat recovery from flue gas can be done by
Options- A. preheating of cold stock.
- B. preheating of combustion air.
- C. steam generation in waste heat boilers.
- D. all (a), (b) and (c). Discuss
Furnace Technology problems
Search Results
Correct Answer: zircon powder
Correct Answer: all (a), (b) & (c).
Correct Answer: rotary Kiln
Correct Answer: all (a), (b) and (c).
Correct Answer: both (a) & (b)
Correct Answer: less
Correct Answer: By-product coke oven
Correct Answer: all (a), (b) and (c).
Correct Answer: radiation
Correct Answer: all (a), (b) and (c).
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