Discussion
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- Question
In low or standard frequency induction furnace, heat is produced by the
Options- A. combination of induced current and skin effect.
- B. induction and resistance.
- C. current flow through a heating element.
- D. none of these.
- Correct Answer
- induction and resistance.
- 1. Heat transfer rate to the charge/stock in a furnace does not depend upon the
Options- A. type of fuels viz solid, liquid or gaseous.
- B. flue gas temperature.
- C. emissivity of refractory walls.
- D. initial temperature of the charged stock. Discuss
- 2. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
Options- A. Economiser.
- B. Regenerator.
- C. Ceramic recuperator.
- D. Waste heat boiler. Discuss
- 3. Very high pressure boilers are usually __________ boilers.
Options- A. fire tube
- B. water tube
- C. waste heat
- D. natural circulation Discuss
- 4. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.
Options- A. 350
- B. 750
- C. 1050
- D. 1250 Discuss
- 5. Rotary kilns are used in the
Options- A. calcination of limestone & dolomite.
- B. cement manufacture.
- C. both (a) and (b).
- D. neither (a) nor (6). Discuss
- 6. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
Options- A. reduces the flue gas temperature and makes the furnace atmosphere oxidising.
- B. increases the load on the induced draft fan.
- C. reduces the furnace draught.
- D. all (a), (b) and (c) Discuss
- 7. Specific heating capacity of a furnace is expressed as
Options- A. weight heated/hr
- B. weight heated/furnace volume
- C. weight heated/hr/furnace volume
- D. none of these Discuss
- 8. Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an
Options- A. blast furnace.
- B. steam boiler.
- C. salt bath furnace.
- D. annealing furnace. Discuss
- 9. Shaft furnaces are used for
Options- A. smelting
- B. calcining
- C. roasting
- D. all (a), (b) and (c) Discuss
- 10. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
Options- A. furnace oil with air.
- B. furnace oil with oxygen.
- C. blast furnace gas with air.
- D. blast furnace gas with oxygen. Discuss
Furnace Technology problems
Search Results
Correct Answer: type of fuels viz solid, liquid or gaseous.
Correct Answer: Regenerator.
Correct Answer: natural circulation
Correct Answer: 750
Correct Answer: both (a) and (b).
Correct Answer: all (a), (b) and (c)
Correct Answer: weight heated/hr/furnace volume
Correct Answer: salt bath furnace.
Correct Answer: all (a), (b) and (c)
Correct Answer: blast furnace gas with air.
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