Discussion
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- Question
Pick out the wrong statement.
Options- A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen.
- B. Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures.
- C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness.
- D. none of these.
- Correct Answer
- none of these.
- 1. Which of the following variables does not affect the furnace capacity?
Options- A. Size of the furnace.
- B. Gas velocity in furnace.
- C. Ratio of wall surface to surface of stock.
- D. None of these. Discuss
- 2. Fuel economy in an industrial furnace operation can not be achieved by the use of
Options- A. stoichiometric combustion air.
- B. non-preheated combustion air.
- C. combustion air not enriched with oxygen.
- D. recupterators. Discuss
- 3. The rate of scaling of furnace stock depends upon the
Options- A. temperature
- B. time
- C. nature of atmosphere
- D. all (a), (b) and (c) Discuss
- 4. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Options- A. transportation of coal.
- B. drying of coal.
- C. combustion of coal by supplying it around the burner.
- D. preheating the primary air. Discuss
- 5. Advantages of use of preheated combustion air are
Options- A. saving in fuel consumption.
- B. reduction in scale losses.
- C. increase in flame temperature.
- D. all (a), (b) and (c). Discuss
- 6. Thermal efficiency of an open hearth furnace may be about __________ percent.
Options- A. 5
- B. 20
- C. 50
- D. 80 Discuss
- 7. Neutral atmosphere is maintained in a/an __________ furnace.
Options- A. cold rolled steel coil annealing
- B. open hearth
- C. soaking pit
- D. walking beam reheating Discuss
- 8. An example of recuperative furnace is the
Options- A. soaking pit
- B. open hearth furnace
- C. coke ovens
- D. none of these Discuss
- 9. Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
Options- A. Coke oven.
- B. Blast furnace stoves.
- C. Beehive coke oven.
- D. High pressure boiler. Discuss
- 10. Circulation of gases in furnace is caused by the
Options- A. change in volume during a change of temperature.
- B. difference in density between hot and cold gases.
- C. furnace pressure in conjunction with draft in flues.
- D. all (a), (b) and (c). Discuss
Furnace Technology problems
Search Results
Correct Answer: None of these.
Correct Answer: stoichiometric combustion air.
Correct Answer: all (a), (b) and (c)
Correct Answer: combustion of coal by supplying it around the burner.
Correct Answer: all (a), (b) and (c).
Correct Answer: 20
Correct Answer: cold rolled steel coil annealing
Correct Answer: soaking pit
Correct Answer: High pressure boiler.
Correct Answer: all (a), (b) and (c).
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