Furnace Technology problems
- 1. The reason for excessive clinker formation in gas producers is the
Options- A. use of coal/coke containing a high % of fines and ash.
- B. use of fuel having too low an ash fusion temperature.
- C. development of hot spots in the fuel bed and an abnormally high rate of gasification.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 2. Heat transfer rate to the stock/charge in the furnace does not depend upon the
Options- A. emissivity of the refactory walls.
- B. size of the furance.
- C. use of waste heat recovery equipments.
- D. thickness of the stock. Discuss
Correct Answer: use of waste heat recovery equipments.
- 3. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
Options- A. 20
- B. 40
- C. 65
- D. 80 Discuss
Correct Answer: 40
- 4. Which of the following is a natural draft furnace?
Options- A. Blast furnace stoves
- B. Power plant boilers
- C. Sintering furnace
- D. None of these Discuss
Correct Answer: Blast furnace stoves
- 5. Soaking pits are meant for heating steel
Options- A. ingots
- B. coils
- C. sheets
- D. slabs Discuss
Correct Answer: ingots
- 6. Which is the most thermally efficient furnace?
Options- A. Reheating furnace
- B. Reverberatory furnace
- C. Rotary kilns
- D. Boiler furnace Discuss
Correct Answer: Boiler furnace
- 7. Which of the following is the most suitable for preheating combustion air above 650°C?
Options- A. Regenerator
- B. Metallic recuperator
- C. Ceramic recuperator
- D. None of these Discuss
Correct Answer: Ceramic recuperator
- 8. The purpose of controlling the furnace atmosphere is to prevent surface attack by
Options- A. oxidation/scaling
- B. decarburising
- C. sulphur penetration
- D. either of the above Discuss
Correct Answer: either of the above
- 9. __________ is an indirectly heated furnace.
Options- A. Open hearth furnace
- B. Muffle furnace
- C. Soaking pit
- D. Reheating furnace Discuss
Correct Answer: Muffle furnace
- 10. Which is a continuous furnace?
Options- A. Coke ovens
- B. Annealing furnace
- C. Glass tank furnace
- D. None of these Discuss
Correct Answer: Glass tank furnace
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