Furnace Technology problems
- 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
Correct Answer: all (a), (b) and (c).
- 2. 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). Discuss
Correct Answer: accelerates the burning rate and economises on fuel consumption.
- 3. In salt bath furnace, heat is transferred to the charge mainly by
Options- A. conduction
- B. convection
- C. radiation
- D. none of these Discuss
Correct Answer: conduction
- 4. Reheating furnace (pusher type) is used for heating
Options- A. ingots
- B. slabs
- C. steel coils
- D. steel sheets Discuss
Correct Answer: slabs
- 5. 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
Correct Answer: all (a), (b) and (c).
- 6. 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
Correct Answer: all (a), (b) and (c).
- 7. 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
Correct Answer: premix
- 8. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.
Options- A. 5
- B. 60
- C. 20
- D. 40 Discuss
Correct Answer: 20
- 9. The resistance furnace produces heat by the
Options- A. electric arc struck between electrodes and the charge.
- B. flow of current through a heating element.
- C. combination of induced current and skin effect.
- D. none of these Discuss
Correct Answer: flow of current through a heating element.
- 10. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
Options- A. sidefired
- B. underfired
- C. covered
- D. recirculating Discuss
Correct Answer: underfired
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