Furnace Technology problems
- 1. Blast furnace stoves are meant for heating
Options- A. air
- B. blast furnace gas
- C. steam
- D. none of these Discuss
Correct Answer: air
- 2. Oxygen enrichment of combustion air does not result in increase of the
Options- A. flame temperature.
- B. oxygen in the flue gas.
- C. stack loss.
- D. heat transfer rate in the furnace. Discuss
Correct Answer: oxygen in the flue gas.
- 3. Rate of heat release in a furnace, which is the measure of heat intensity is defined as
Options- A. kcal/hr/m3 combustion space.
- B. kcal/m3 combustion space.
- C. kcal/hr.
- D. none of these. Discuss
Correct Answer: kcal/hr/m3 combustion space.
- 4. Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
Options- A. Increase in calorific value of the fuel.
- B. Increase in flame temperature.
- C. Reduction in scale losses.
- D. Saving in fuel consumption. Discuss
Correct Answer: Increase in calorific value of the fuel.
- 5. Fuel economy in furnaces can be achieved by
Options- A. using oxygen enriched combustion air.
- B. preheating the combustion air.
- C. reducing the heat loss through furnace openings & doors.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 6. Which of the following is not a recuperative furnace?
Options- A. Soaking pit
- B. Reheating furnace
- C. Steamboiler
- D. Coke oven. Discuss
Correct Answer: Coke oven.
- 7. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °C.
Options- A. 2000
- B. 3000
- C. 4500
- D. 6000 Discuss
Correct Answer: 4500
- 8. Which is not accomplished in an underfired furnace?
Options- A. Increase in heating capacity/m2 of floor space.
- B. Elimination of cold spot at the bottom of the charge.
- C. Reduction in the temperature of furnace gases.
- D. Portection of the periphery of the charge from excessive radiation. Discuss
Correct Answer: Increase in heating capacity/m2 of floor space.
- 9. Main gas valve in a gaseous fuel burner is a __________ valve.
Options- A. gate
- B. butterfly
- C. globe
- D. none of these Discuss
Correct Answer: gate
- 10. Overfire burning in a furnace is a phenomenon characterised by
Options- A. supply of excess fuel.
- B. supply of excess air.
- C. burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air.
- D. none of these. Discuss
Correct Answer: burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air.
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