Discussion
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- Question
An example of shaft furnace is the
Options- A. L.D. converter
- B. glass melting tank
- C. blast furnace
- D. soaking pit
- Correct Answer
- blast furnace
- 1. In reverberatory furnace, charge is heated mainly by
Options- A. conduction.
- B. natural convection.
- C. radiation of heat from the roof of the combustion chamber.
- D. none of these. Discuss
- 2. Fuel used in B.F. stove is
Options- A. pulverised coal
- B. furnace oil
- C. blast furnace gas/mixed gas
- D. coke oven gas Discuss
- 3. In order to maintain a reducing atmosphere in a furnace, it should have
Options- A. no O2 in flue gas
- B. CO in flue gas
- C. high excess air
- D. none of these Discuss
- 4. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
Options- A. 50
- B. 65
- C. 85
- D. 99 Discuss
- 5. Ostwald charts are meant for
Options- A. computing the excess/deficiency of combustion air.
- B. calculation of flue gas temperature.
- C. computation of flue gas analysis.
- D. none of these. Discuss
- 6. 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
- 7. __________ atmosphere is maintained inside an iron blast furnace.
Options- A. Oxidising
- B. Reducing
- C. Inert
- D. Decarburising Discuss
- 8. 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
- 9. 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
- 10. 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
Furnace Technology problems
Search Results
Correct Answer: radiation of heat from the roof of the combustion chamber.
Correct Answer: blast furnace gas/mixed gas
Correct Answer: CO in flue gas
Correct Answer: 85
Correct Answer: computing the excess/deficiency of combustion air.
Correct Answer: all (a), (b) and (c).
Correct Answer: Reducing
Correct Answer: drying/tempering of refractories.
Correct Answer: 650
Correct Answer: positive pressure exists in the furnace.
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