Furnace Technology problems
- 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
Correct Answer: None of these.
- 2. 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. Discuss
Correct Answer: none of these.
- 3. Thermal efficiency of an open hearth furnace may be about __________ percent.
Options- A. 5
- B. 20
- C. 50
- D. 80 Discuss
Correct Answer: 20
- 4. 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
Correct Answer: cold rolled steel coil annealing
- 5. An example of recuperative furnace is the
Options- A. soaking pit
- B. open hearth furnace
- C. coke ovens
- D. none of these Discuss
Correct Answer: soaking pit
- 6. 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
Correct Answer: High pressure boiler.
- 7. 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
Correct Answer: all (a), (b) and (c).
- 8. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of
Options- A. use of non-preheated combustion air.
- B. use of pulverised solid fuels.
- C. imperfect mixing of fuel & air and infiltration of air.
- D. use of excessive positive draft in the furnace. Discuss
Correct Answer: imperfect mixing of fuel & air and infiltration of air.
- 9. Unit of furnace loading is
Options- A. ton stock/hr/m2 hearth area
- B. ton stock/hr
- C. ton stock/m2 hearth area
- D. both (b) and (c) Discuss
Correct Answer: ton stock/hr/m2 hearth area
- 10. The function of an economiser in a boiler is to preheat the
Options- A. feedwater
- B. combustion air
- C. pulverised coal
- D. furnace oil Discuss
Correct Answer: feedwater
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