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- Question
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
- Correct Answer
- radiation
- 1. 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
- 2. 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
- 3. 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
- 4. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.
Options- A. 20
- B. 40
- C. 60
- D. 80 Discuss
- 5. 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
- 6. 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
- 7. Means for giving direction to the circulation of gases in furnaces are
Options- A. fans.
- B. arrangement of heating stock in the furnaces.
- C. location of outlet ports and heating & combustion devices.
- D. all (a), (b) and (c). Discuss
- 8. Which furnace employs preheating, heating and soaking zones?
Options- A. Soaking pit
- B. Reheating furnace
- C. Open hearth furnace
- D. Cupola Discuss
- 9. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.
Options- A. 15
- B. 40
- C. 70
- D. 85 Discuss
- 10. Low stack loss indicates the
Options- A. use of sub-stoichiometric air for combustion.
- B. efficient use of fuel.
- C. inefficient use of fuel.
- D. oxygen enrichment of combustion air. Discuss
Furnace Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: By-product coke oven
Correct Answer: less
Correct Answer: 80
Correct Answer: zircon powder
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c).
Correct Answer: Reheating furnace
Correct Answer: 40
Correct Answer: efficient use of fuel.
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