Furnace Technology problems
- 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
Correct Answer: occupy more space
- 2. 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 Discuss
Correct Answer: 25-30
- 3. 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
Correct Answer: all (a), (b) and (c).
- 4. Hearth furnaces are not used for
Options- A. roasting
- B. melting
- C. reheating
- D. none of these Discuss
Correct Answer: none of these
- 5. 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
Correct Answer: radiation
- 6. 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
Correct Answer: damper
- 7. Which of the following is a periodic furnace?
Options- A. Tunnel kiln
- B. Rotary kiln
- C. Soaking pit
- D. Reheating furnace. Discuss
Correct Answer: Soaking pit
- 8. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing?
Options- A. Ash disposal problem.
- B. Excessive fly ash discharge from the stack.
- C. Higher power consumption in its transportation.
- D. Erosion of induced draft fan blades. Discuss
Correct Answer: Ash disposal problem.
- 9. An example of indirectly heated furnace is the
Options- A. soaking pit
- B. muffle furnace
- C. reheating furnace
- D. none of these Discuss
Correct Answer: muffle furnace
- 10. Forced recirculation of furnace gases is practised
Options- A. to increase heat transfer by convection.
- B. to ensure uniform temperature.
- C. in furnaces, operating below 750°C.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
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