Discussion
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- Question
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.
- Correct Answer
- Ash disposal problem.
- 1. Which of the following is a periodic furnace?
Options- A. Tunnel kiln
- B. Rotary kiln
- C. Soaking pit
- D. Reheating furnace. Discuss
- 2. 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
- 3. 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
- 4. Hearth furnaces are not used for
Options- A. roasting
- B. melting
- C. reheating
- D. none of these Discuss
- 5. 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
- 6. An example of indirectly heated furnace is the
Options- A. soaking pit
- B. muffle furnace
- C. reheating furnace
- D. none of these Discuss
- 7. 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
- 8. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
Options- A. 50
- B. 100
- C. 150
- D. 250 Discuss
- 9. The method of Lobo and Evans is concerned with the calculation of the
Options- A. heat absorption in radiant section of a furnace.
- B. heat transfer by forced convection in a reboiler.
- C. heat transfer in vacuum condensers.
- D. mass transfer co-efficient. Discuss
- 10. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
Options- A. furnace employing neutral atmosphere.
- B. carbon resistance furnace.
- C. reducing atmosphere.
- D. furnace employing negative pressure. Discuss
Furnace Technology problems
Search Results
Correct Answer: Soaking pit
Correct Answer: damper
Correct Answer: radiation
Correct Answer: none of these
Correct Answer: all (a), (b) and (c).
Correct Answer: muffle furnace
Correct Answer: all (a), (b) and (c).
Correct Answer: 150
Correct Answer: heat absorption in radiant section of a furnace.
Correct Answer: carbon resistance furnace.
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