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MCQs

Total Questions : 757 | Page 4 of 76 pages
Question 31. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
  1.    < 2
  2.    < 5
  3.    < 8
  4.    < 10
 Discuss Question
Answer: Option A. -> < 2
Question 32. Hearth furnaces are not used for
  1.    Roasting
  2.    Melting
  3.    Reheating
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 33. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
  1.    50
  2.    65
  3.    85
  4.    99
 Discuss Question
Answer: Option C. -> 85
Question 34. The heating capacity of continuous reheating furnace depends upon the
  1.    Hearth area and furnace temperature
  2.    Emissivity of the stock
  3.    Ratio of wall surface to stock surface
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 35. Means for giving direction to the circulation of gases in furnaces are
  1.    Fans
  2.    Arrangement of heating stock in the furnaces
  3.    Location of outlet ports and heating & combustion devices
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 36. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
  1.    Premix
  2.    Outside mixing type
  3.    Rotary
  4.    Diffusion
 Discuss Question
Answer: Option A. -> Premix
Question 37. Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of
  1.    Furnace oil with air
  2.    Furnace oil with oxygen
  3.    Blast furnace gas with air
  4.    Blast furnace gas with oxygen
 Discuss Question
Answer: Option C. -> Blast furnace gas with air
Question 38. Protective gas used in the annealing furnace for steel coil comprises of
  1.    95% N₂ + 5% H₂
  2.    5% H₂ + 9% N₂
  3.    100% CO
  4.    100 %H₂
 Discuss Question
Answer: Option A. -> 95% N₂ + 5% H₂
Question 39. __________ furnace is not an electric furnace.
  1.    Arc
  2.    Induction
  3.    Pot
  4.    Resistance
 Discuss Question
Answer: Option C. -> Pot
Question 40. In reverberatory furnace, charge is heated mainly by
  1.    Conduction
  2.    Natural convection
  3.    Radiation of heat from the roof of the combustion chamber
  4.    None of these
 Discuss Question
Answer: Option C. -> Radiation of heat from the roof of the combustion chamber

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