Discussion
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- Question
Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
Options- A. 20
- B. 40
- C. 65
- D. 80
- Correct Answer
- 40
- 1. 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
- 2. 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
- 3. Which of the following is a component of working capital investment?
Options- A. Utilities plants.
- B. Maintenance and repair inventory.
- C. Process equipments.
- D. Depreciation. Discuss
- 4. __________ of depreciation calculation accounts for the interest on investement.
Options- A. Straight line method
- B. Declining balance
- C. both (a) and (b)
- D. neither (a) nor (b). Discuss
- 5. The economic life of a large chemical process plant as compared to a small chemical plant is
Options- A. only slightly more
- B. much more
- C. slightly less
- D. almost equal Discuss
- 6. 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
- 7. Soaking pits are meant for heating steel
Options- A. ingots
- B. coils
- C. sheets
- D. slabs Discuss
- 8. Which is the most thermally efficient furnace?
Options- A. Reheating furnace
- B. Reverberatory furnace
- C. Rotary kilns
- D. Boiler furnace Discuss
- 9. 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
- 10. 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
Furnace Technology problems
Search Results
Correct Answer: use of waste heat recovery equipments.
Correct Answer: all (a), (b) and (c).
Correct Answer: Maintenance and repair inventory.
Correct Answer: neither (a) nor (b).
Correct Answer: much more
Correct Answer: Blast furnace stoves
Correct Answer: ingots
Correct Answer: Boiler furnace
Correct Answer: Ceramic recuperator
Correct Answer: either of the above
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