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MCQs

Total Questions : 757 | Page 1 of 76 pages
Question 1. Overfire burning in a furnace is a phenomenon characterised by
  1.    Supply of excess fuel
  2.    Supply of excess air
  3.    Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
  4.    None of these
 Discuss Question
Answer: Option C. -> Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air
Question 2. __________ is an indirectly heated furnace.
  1.    Open hearth furnace
  2.    Muffle furnace
  3.    Soaking pit
  4.    Reheating furnace
 Discuss Question
Answer: Option B. -> Muffle furnace
Question 3. Which of the following variables does not affect the furnace capacity?
  1.    Size of the furnace
  2.    Gas velocity in furnace
  3.    Ratio of wall surface to surface of stock
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 4. Reducing atmosphere is maintained in a
  1.    Calcination kiln
  2.    Blast furnace
  3.    Soaking pit
  4.    L.D. converter
 Discuss Question
Answer: Option B. -> Blast furnace
Question 5. Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.
  1.    20
  2.    40
  3.    65
  4.    80
 Discuss Question
Answer: Option B. -> 40
Question 6. Main gas valve in a gaseous fuel burner is a __________ valve.
  1.    Gate
  2.    Butterfly
  3.    Globe
  4.    None of these
 Discuss Question
Answer: Option A. -> Gate
Question 7. Ingress of cold air in the furnaces through cracks, charging doors, openings etc.
  1.    Reduces the flue gas temperature and makes the furnace atmosphere oxidising
  2.    Increases the load on the induced draft fan
  3.    Reduces the furnace draught
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 8. Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
  1.    Coke oven
  2.    Blast furnace stoves
  3.    Beehive coke oven
  4.    High pressure boiler
 Discuss Question
Answer: Option D. -> High pressure boiler
Question 9. The function of an economiser in a boiler is to preheat the
  1.    Feedwater
  2.    Combustion air
  3.    Pulverised coal
  4.    Furnace oil
 Discuss Question
Answer: Option A. -> Feedwater
Question 10. __________ atmosphere is maintained inside an iron blast furnace.
  1.    Oxidising
  2.    Reducing
  3.    Inert
  4.    Decarburising
 Discuss Question
Answer: Option B. -> Reducing

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