Discussion
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- Question
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
Options- A. transportation of coal.
- B. drying of coal.
- C. combustion of coal by supplying it around the burner.
- D. preheating the primary air.
- Correct Answer
- combustion of coal by supplying it around the burner.
- 1. Advantages of use of preheated combustion air are
Options- A. saving in fuel consumption.
- B. reduction in scale losses.
- C. increase in flame temperature.
- D. all (a), (b) and (c). Discuss
- 2. Furnace aerodynamics is related to the __________ in the furnace.
Options- A. movement of gases
- B. measurement of flue gas volume
- C. temperature control
- D. pressure adjustment Discuss
- 3. Combustion of fuel in a furnace with oxygen enriched air results in higher
Options- A. flue gas volume
- B. flame temperature
- C. fuel consumption
- D. stack loss Discuss
- 4. Which one is not an induced draught furnace?
Options- A. Blast furnace stove
- B. Sintering furnace
- C. High pressure boiler
- D. None of these Discuss
- 5. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the
Options- A. physical nature, ash content and fineness of the coal.
- B. amount of excess air supplied and load on the boiler.
- C. type of burner and combustion chamber.
- D. all (a), (b) and (c) Discuss
- 6. The rate of scaling of furnace stock depends upon the
Options- A. temperature
- B. time
- C. nature of atmosphere
- D. all (a), (b) and (c) Discuss
- 7. Fuel economy in an industrial furnace operation can not be achieved by the use of
Options- A. stoichiometric combustion air.
- B. non-preheated combustion air.
- C. combustion air not enriched with oxygen.
- D. recupterators. Discuss
- 8. Which of the following variables does not affect the furnace capacity?
Options- A. Size of the furnace.
- B. Gas velocity in furnace.
- C. Ratio of wall surface to surface of stock.
- D. None of these. Discuss
- 9. Pick out the wrong statement.
Options- A. Addition of methane to the furnace atmosphere reduces decarburising by hydrogen.
- B. Nitrogen in presence of steam decar-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures.
- C. Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness.
- D. none of these. Discuss
- 10. Thermal efficiency of an open hearth furnace may be about __________ percent.
Options- A. 5
- B. 20
- C. 50
- D. 80 Discuss
Furnace Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: movement of gases
Correct Answer: flame temperature
Correct Answer: Blast furnace stove
Correct Answer: all (a), (b) and (c)
Correct Answer: all (a), (b) and (c)
Correct Answer: stoichiometric combustion air.
Correct Answer: None of these.
Correct Answer: none of these.
Correct Answer: 20
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