Furnace Technology problems
- 1. Which of the following is a batch furnace?
Options- A. Cupola
- B. Reheating furnace
- C. Glass tank furnace
- D. None of these Discuss
Correct Answer: Cupola
- 2. Maximum thermal efficiency of boiler may be about __________ percent.
Options- A. 10
- B. 25
- C. 65
- D. 90 Discuss
Correct Answer: 90
- 3. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
Options- A. resistance
- B. arc
- C. low frequency induction
- D. none of these Discuss
Correct Answer: arc
- 4. Which of the following accentuates clinker-ing troubles on furnace grate burning coal?
Options- A. Low reactivity of carbonised residue containing high proportion of iron & sulphur.
- B. Low forced draft & fuel bed temperature.
- C. Thick firebed and preheated primary air.
- D. All (a), (b) and (c). Discuss
Correct Answer: All (a), (b) and (c).
- 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
Correct Answer: both (a) and (b).
- 6. 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
Correct Answer: 750
- 7. Very high pressure boilers are usually __________ boilers.
Options- A. fire tube
- B. water tube
- C. waste heat
- D. natural circulation Discuss
Correct Answer: natural circulation
- 8. 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
Correct Answer: Regenerator.
- 9. 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
Correct Answer: type of fuels viz solid, liquid or gaseous.
- 10. 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. Discuss
Correct Answer: induction and resistance.
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