Furnace Technology problems
- 1. An example of shaft furnace is the
Options- A. L.D. converter
- B. glass melting tank
- C. blast furnace
- D. soaking pit Discuss
Correct Answer: blast furnace
- 2. In a muffle furnace, the muffle
Options- A. retards the heat transfer.
- B. assists in temperature equalisation in the charge.
- C. permits the use of controlled atmosphere for the protection of stock.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 3. __________ atmosphere is maintained inside an iron blast furnace.
Options- A. Oxidising
- B. Reducing
- C. Inert
- D. Decarburising Discuss
Correct Answer: Reducing
- 4. Tunnel kilns are usually used for
Options- A. roasting of pyrites.
- B. drying/tempering of refractories.
- C. reheating of slabs.
- D. melting of glass. Discuss
Correct Answer: drying/tempering of refractories.
- 5. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.
Options- A. 250
- B. 650
- C. 850
- D. 1000 Discuss
Correct Answer: 650
- 6. In a furnace employing forced draught as compared to induced draught,
Options- A. air is sucked in, so air leaks are more and hence the furnace efficiency is reduced.
- B. the fan operates hot and hence blades are liable to corrosion and erosion.
- C. positive pressure exists in the furnace.
- D. none of these Discuss
Correct Answer: positive pressure exists in the furnace.
- 7. In producer gas making furnace, steam is added along with air to mainly control the
Options- A. fusion of coal ash & clinker formation.
- B. C. V. of producer gas.
- C. temperature of producer gas.
- D. tar content in producer gas. Discuss
Correct Answer: fusion of coal ash & clinker formation.
- 8. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?
Options- A. Ammonia
- B. Fine dolomite
- C. Alkaline powders
- D. None of these Discuss
Correct Answer: None of these
- 9. Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of
Options- A. low emissivity
- B. high thermal conductivity
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) and (b)
- 10. Large tonnage of refractory bricks are dried in a
Options- A. shaft furnace
- B. rotary hearth furnace
- C. tunnel kiln
- D. muffle furnace Discuss
Correct Answer: tunnel kiln
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