Discussion
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- Question
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
- Correct Answer
- 85
- 1. 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
- 2. Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.
Options- A. 80
- B. 130
- C. 180
- D. 250 Discuss
- 3. Calcination of limestone to produce lime is done in a __________ kiln.
Options- A. tunnel
- B. rotary
- C. vertical shaft
- D. both (b) and (c) Discuss
- 4. An example of a periodic furnace is the
Options- A. blast furnace stoves
- B. blast furnace
- C. coke oven heating chamber
- D. rotary kilns Discuss
- 5. Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
Options- A. increasing the draft in the furnace.
- B. preheating the fuel gas.
- C. oxygen enrichment of combustion air.
- D. preheating the combustion air. Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. An example of shaft furnace is the
Options- A. L.D. converter
- B. glass melting tank
- C. blast furnace
- D. soaking pit Discuss
- 10. 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
Furnace Technology problems
Search Results
Correct Answer: computing the excess/deficiency of combustion air.
Correct Answer: 130
Correct Answer: both (b) and (c)
Correct Answer: blast furnace stoves
Correct Answer: increasing the draft in the furnace.
Correct Answer: CO in flue gas
Correct Answer: blast furnace gas/mixed gas
Correct Answer: radiation of heat from the roof of the combustion chamber.
Correct Answer: blast furnace
Correct Answer: all (a), (b) and (c).
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