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- Question
The advantages of firing pulverised coal in the furnace lies in the fact that, it
Options- A. permits the use of high ash content coal.
- B. permits the use of low fusion point ash coal.
- C. accelerates the burning rate and economises on fuel consumption.
- D. all (a), (b) and (c).
- Correct Answer
- accelerates the burning rate and economises on fuel consumption.
- 1. Presence of SO2 in furnace gases attacks the ferrous metal by way of
Options- A. accelerating the rate of scaling.
- B. causing metal embrittlement.
- C. attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature.
- D. all (a), (b) and (c). Discuss
- 2. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
Options- A. < 2
- B. < 5
- C. < 8
- D. < 10 Discuss
- 3. In a furnace operation, which is not preheated?
Options- A. Solid fuels.
- B. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.).
- C. Both (a) and (b).
- D. Neither (a) nor (b). Discuss
- 4. In order to maintain an oxidising atmosphere in a furnace, it should have
Options- A. more of excess air
- B. less of excess air
- C. more of CO in flue gas
- D. more of CO2 in flue gas Discuss
- 5. Regenerators as compared to recuperators for the same duty
Options- A. store smaller quantity of waste heat
- B. are lighter & compact
- C. involve higher initial cost
- D. all (a), (b) & (c) Discuss
- 6. In salt bath furnace, heat is transferred to the charge mainly by
Options- A. conduction
- B. convection
- C. radiation
- D. none of these Discuss
- 7. Reheating furnace (pusher type) is used for heating
Options- A. ingots
- B. slabs
- C. steel coils
- D. steel sheets Discuss
- 8. Decarburisation of steel
Options- A. is the removal of carbon from iron carbide (Fe3C).
- B. affects its crystalline structure.
- C. is favoured by CO2.
- D. all (a), (b) and (c). Discuss
- 9. The heating capacity of continuous reheating furnace depends upon the
Options- A. hearth area and furnace temperature.
- B. emissivity of the stock.
- C. ratio of wall surface to stock surface.
- D. all (a), (b) and (c). Discuss
- 10. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
Options- A. premix
- B. outside mixing type
- C. rotary
- D. diffusion Discuss
Furnace Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: < 2
Correct Answer: Both (a) and (b).
Correct Answer: more of excess air
Correct Answer: involve higher initial cost
Correct Answer: conduction
Correct Answer: slabs
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c).
Correct Answer: premix
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