Furnace Technology problems
- 1. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
Options- A. 50
- B. 100
- C. 150
- D. 250 Discuss
Correct Answer: 150
- 2. The method of Lobo and Evans is concerned with the calculation of the
Options- A. heat absorption in radiant section of a furnace.
- B. heat transfer by forced convection in a reboiler.
- C. heat transfer in vacuum condensers.
- D. mass transfer co-efficient. Discuss
Correct Answer: heat absorption in radiant section of a furnace.
- 3. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
Options- A. furnace employing neutral atmosphere.
- B. carbon resistance furnace.
- C. reducing atmosphere.
- D. furnace employing negative pressure. Discuss
Correct Answer: carbon resistance furnace.
- 4. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
Options- A. Ostwald chart
- B. Cox chart
- C. Sankey diagram
- D. none of these Discuss
Correct Answer: Sankey diagram
- 5. Which furnace employs natural draft?
Options- A. Coke oven
- B. Boiler
- C. Rotary kilns
- D. L.D. converter Discuss
Correct Answer: Coke oven
- 6. Turndown ratio of a burner gives an idea of the __________ in the furnace.
Options- A. range of fuel firing rates
- B. volume of the combustion chamber
- C. maximum heat input rate only
- D. minimum heat input rate only Discuss
Correct Answer: range of fuel firing rates
- 7. Regenerators are used for waste heat recovery in
Options- A. by-product coke ovens
- B. beehive coke oven
- C. blast furnace stoves
- D. soaking pits Discuss
Correct Answer: by-product coke ovens
- 8. Dampers are located
Options- A. before the I.D fan
- B. after the I.D. fan
- C. near the top of the chimney
- D. anywhere after the I.D. fan Discuss
Correct Answer: before the I.D fan
- 9. Reverberatory furnace is used for
Options- A. roasting/reduction of ores
- B. annealing steel coil
- C. heating air
- D. steel melting Discuss
Correct Answer: roasting/reduction of ores
- 10. Protective gas used in the annealing furnace for steel coil comprises of
Options- A. 95% N2 + 5% H2
- B. 5% H2 + 9% N2
- C. 100% CO
- D. 100 %H2 Discuss
Correct Answer: 95% N2 + 5% H2
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