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- Question
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.
- Correct Answer
- oxygen in the flue gas.
- 1. Blast furnace stoves are meant for heating
Options- A. air
- B. blast furnace gas
- C. steam
- D. none of these Discuss
- 2. The function of an economiser in a boiler is to preheat the
Options- A. feedwater
- B. combustion air
- C. pulverised coal
- D. furnace oil Discuss
- 3. Unit of furnace loading is
Options- A. ton stock/hr/m2 hearth area
- B. ton stock/hr
- C. ton stock/m2 hearth area
- D. both (b) and (c) Discuss
- 4. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of
Options- A. use of non-preheated combustion air.
- B. use of pulverised solid fuels.
- C. imperfect mixing of fuel & air and infiltration of air.
- D. use of excessive positive draft in the furnace. Discuss
- 5. Circulation of gases in furnace is caused by the
Options- A. change in volume during a change of temperature.
- B. difference in density between hot and cold gases.
- C. furnace pressure in conjunction with draft in flues.
- D. all (a), (b) and (c). Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Which of the following is not a recuperative furnace?
Options- A. Soaking pit
- B. Reheating furnace
- C. Steamboiler
- D. Coke oven. Discuss
- 10. 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
Furnace Technology problems
Search Results
Correct Answer: air
Correct Answer: feedwater
Correct Answer: ton stock/hr/m2 hearth area
Correct Answer: imperfect mixing of fuel & air and infiltration of air.
Correct Answer: all (a), (b) and (c).
Correct Answer: kcal/hr/m3 combustion space.
Correct Answer: Increase in calorific value of the fuel.
Correct Answer: all (a), (b) and (c).
Correct Answer: Coke oven.
Correct Answer: 4500
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