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MCQs

Total Questions : 757 | Page 5 of 76 pages
Question 41. Scaling of furnace stock is reduced by __________ in flue gas.
  1.    CO
  2.    H₂
  3.    High CO/CO₂
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 42. Which is a regenerative furnace?
  1.    Coke oven heating chamber
  2.    Open hearth furnace
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A and B
Question 43. Dampers are located
  1.    Before the I.D fan
  2.    After the I.D. fan
  3.    Near the top of the chimney
  4.    Anywhere after the I.D. fan
 Discuss Question
Answer: Option A. -> Before the I.D fan
Question 44. Cement Kiln is a
  1.    Rotary Kiln
  2.    Tunnel Kiln
  3.    Natural draft furnace
  4.    Batch furnace
 Discuss Question
Answer: Option A. -> Rotary Kiln
Question 45. Decarburisation of steel
  1.    Is the removal of carbon from iron carbide (Fe₃C)
  2.    Affects its crystalline structure
  3.    Is favoured by CO₂
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 46. An example of indirectly heated furnace is the
  1.    Soaking pit
  2.    Muffle furnace
  3.    Reheating furnace
  4.    None of these
 Discuss Question
Answer: Option B. -> Muffle furnace
Question 47. The resistance furnace produces heat by the
  1.    Electric arc struck between electrodes and the charge
  2.    Flow of current through a heating element
  3.    Combination of induced current and skin effect
  4.    None of these
 Discuss Question
Answer: Option B. -> Flow of current through a heating element
Question 48. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?
  1.    Economiser
  2.    Regenerator
  3.    Ceramic recuperator
  4.    Waste heat boiler
 Discuss Question
Answer: Option B. -> Regenerator
Question 49. Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.
  1.    50
  2.    100
  3.    150
  4.    250
 Discuss Question
Answer: Option C. -> 150
Question 50. In order to maintain a reducing atmosphere in a furnace, it should have
  1.    No O₂ in flue gas
  2.    CO in flue gas
  3.    High excess air
  4.    None of these
 Discuss Question
Answer: Option B. -> CO in flue gas

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