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MCQs

Total Questions : 757 | Page 6 of 76 pages
Question 51. In order to maintain an oxidising atmosphere in a furnace, it should have
  1.    More of excess air
  2.    Less of excess air
  3.    More of CO in flue gas
  4.    More of CO₂ in flue gas
 Discuss Question
Answer: Option A. -> More of excess air
Question 52. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
  1.    Graphite powder
  2.    Thoria
  3.    Zircon powder
  4.    Beryllium
 Discuss Question
Answer: Option C. -> Zircon powder
Question 53. Which of the following furnaces will have maximum thermal efficiency?
  1.    Soaking pits
  2.    Walking beam reheating furnace
  3.    Boiler furnace
  4.    Rotary kilns
 Discuss Question
Answer: Option C. -> Boiler furnace
Question 54. An example of a periodic furnace is the
  1.    Blast furnace stoves
  2.    Blast furnace
  3.    Coke oven heating chamber
  4.    Rotary kilns
 Discuss Question
Answer: Option A. -> Blast furnace stoves
Question 55. Blast furnace stoves are meant for heating
  1.    Air
  2.    Blast furnace gas
  3.    Steam
  4.    None of these
 Discuss Question
Answer: Option A. -> Air
Question 56. Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
  1.    Increasing the draft in the furnace
  2.    Preheating the fuel gas
  3.    Oxygen enrichment of combustion air
  4.    Preheating the combustion air
 Discuss Question
Answer: Option A. -> Increasing the draft in the furnace
Question 57. Neutral atmosphere is maintained in a/an __________ furnace.
  1.    Cold rolled steel coil annealing
  2.    Open hearth
  3.    Soaking pit
  4.    Walking beam reheating
 Discuss Question
Answer: Option A. -> Cold rolled steel coil annealing
Question 58. The method of Lobo and Evans is concerned with the calculation of the
  1.    Heat absorption in radiant section of a furnace
  2.    Heat transfer by forced convection in a reboiler
  3.    Heat transfer in vacuum condensers
  4.    Mass transfer co-efficient
 Discuss Question
Answer: Option A. -> Heat absorption in radiant section of a furnace
Question 59. Combustion of fuel in a furnace with oxygen enriched air results in higher
  1.    Flue gas volume
  2.    Flame temperature
  3.    Fuel consumption
  4.    Stack loss
 Discuss Question
Answer: Option B. -> Flame temperature
Question 60. Pulverised fuel fired furnaces employ __________ fuel firing.
  1.    Horizontal
  2.    Vertical
  3.    Tangential
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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