Discussion
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- Question
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.
Options- A. 10-15
- B. 25-30
- C. 45-50
- D. 65-70
- Correct Answer
- 25-30
- 1. Regenerators compared to the recuperators for the same duty
Options- A. occupy more space
- B. are less costly
- C. are of smaller size
- D. all (a), (b) and (c) Discuss
- 2. Which of the following furnaces will have maximum thermal efficiency?
Options- A. Soaking pits
- B. Walking beam reheating furnace
- C. Boiler furnace
- D. Rotary kilns Discuss
- 3. Use of pulverised coal in boilers provides
Options- A. higher calorific value
- B. better combustion
- C. smokeless burning
- D. less erosion on furnace wall. Discuss
- 4. Air filtration in a furnace
Options- A. reduces its thermal efficiency.
- B. is indicated by flame sting out.
- C. increases the flue gas temperature.
- D. none of these. Discuss
- 5. The heating capacity of muffle furnace depends on the
Options- A. surface area & emissivity of the stock.
- B. properties of the muffle wall (temperature, area, emissivity).
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 6. Heat balance of furnace provides means of determining the
Options- A. thermal efficiency of the process.
- B. sources of heat losses.
- C. scope of reduction of heat losses.
- D. all (a), (b) and (c). Discuss
- 7. Hearth furnaces are not used for
Options- A. roasting
- B. melting
- C. reheating
- D. none of these Discuss
- 8. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by
Options- A. conduction
- B. convection
- C. radiation
- D. can not be predicted. Discuss
- 9. Furnace pressure is normally controlled by regulating the
Options- A. air pressure
- B. fuel gas pressure
- C. speed of I.D. fan
- D. damper Discuss
- 10. Which of the following is a periodic furnace?
Options- A. Tunnel kiln
- B. Rotary kiln
- C. Soaking pit
- D. Reheating furnace. Discuss
Furnace Technology problems
Search Results
Correct Answer: occupy more space
Correct Answer: Boiler furnace
Correct Answer: better combustion
Correct Answer: reduces its thermal efficiency.
Correct Answer: both (a) & (b)
Correct Answer: all (a), (b) and (c).
Correct Answer: none of these
Correct Answer: radiation
Correct Answer: damper
Correct Answer: Soaking pit
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