Furnace Technology problems
- 1. Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the
Options- A. quantity & temperature of waste gas.
- B. dust concentration & nature of dust in waste gas.
- C. corrosive nature of the waste gas.
- D. all (a), (b) and (c). Discuss
Correct Answer: dust concentration & nature of dust in waste gas.
- 2. Which of the following is a directly fired intermittant furnace?
Options- A. Walking beam reheating furnace
- B. Reverberatory furnace
- C. Tower furnace
- D. Tunnel kiln Discuss
Correct Answer: Reverberatory furnace
- 3. Turn down ratio of a burner
Options- A. should be as low as possible i.e., 1 : 2.
- B. should be 1:1 for a batch type furnace..
- C. is the ratio of maximum to minimum permissible heat input rates.
- D. is normally much more for a continuous furnace as compared to a batch furnace. Discuss
Correct Answer: is the ratio of maximum to minimum permissible heat input rates.
- 4. Thermal efficiency of furnaces can be improved by
Options- A. waste heat recovery from flue gas.
- B. minimising heat losses from furnace walls.
- C. maintaining proper draught.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 5. The main function of a muffle in the muffle furnace is to
Options- A. protect the charge from the effects of the products of combustion.
- B. smooth out temperature inequalities on the combustion side of the muffle wall.
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 6. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
Options- A. arc
- B. resistance
- C. low frequency induction
- D. high frequency induction Discuss
Correct Answer: high frequency induction
- 7. The heating capacity of muffle furnace depends on the
Options- A. surface area & emissivity of the stock.
- B. properties of the muffle wall (temperature, area, emissivity).
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 8. Air filtration in a furnace
Options- A. reduces its thermal efficiency.
- B. is indicated by flame sting out.
- C. increases the flue gas temperature.
- D. none of these. Discuss
Correct Answer: reduces its thermal efficiency.
- 9. Use of pulverised coal in boilers provides
Options- A. higher calorific value
- B. better combustion
- C. smokeless burning
- D. less erosion on furnace wall. Discuss
Correct Answer: better combustion
- 10. Which of the following furnaces will have maximum thermal efficiency?
Options- A. Soaking pits
- B. Walking beam reheating furnace
- C. Boiler furnace
- D. Rotary kilns Discuss
Correct Answer: Boiler furnace
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