Furnace Technology problems
- 1. Which of the following is a heat treatment furnace?
Options- A. Muffle furnace
- B. Annealing furnace
- C. Reheating furnace
- D. Rotary kiln Discuss
Correct Answer: Annealing furnace
- 2. Example of an indirectly heated furnace is
Options- A. hood annealing furnace
- B. muffle furnace
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) and (b)
- 3. Pulverised fuel fired furnaces employ __________ fuel firing.
Options- A. horizontal
- B. vertical
- C. tangential
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 4. Ceramic recuperators compared to metallic recuperators for the same duty
Options- A. are lighter.
- B. occupy more space.
- C. are less costly.
- D. have higher pressure differential between flue gas & air side. Discuss
Correct Answer: occupy more space.
- 5. Regenerators are installed in
Options- A. coke ovens
- B. open hearth furnace
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 6. 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
Correct Answer: all (a), (b) and (c).
- 7. Cement Kiln is a
Options- A. rotary Kiln
- B. tunnel Kiln
- C. natural draft furnace
- D. batch furnace Discuss
Correct Answer: rotary Kiln
- 8. 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
Correct Answer: all (a), (b) & (c).
- 9. 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
Correct Answer: zircon powder
- 10. 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
Correct Answer: 80
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