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MCQs

Total Questions : 2441 | Page 22 of 245 pages
Question 211. Natural draft created by the chimney depends upon
  1.    Temperature of the flue gas
  2.    Its height
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 212. The cooling medium used in dry quenching of coke is
  1.    Nitrogen
  2.    Air
  3.    Phenolic water
  4.    Carbon dioxide
 Discuss Question
Answer: Option A. -> Nitrogen
Question 213. Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about __________ °C.
  1.    400-500
  2.    900-1000
  3.    1400-1500
  4.    1700-1800
 Discuss Question
Answer: Option B. -> 900-1000
Question 214. L.D. converter gas (produced in steel plant) comprises mainly of
  1.    CO (upto 65%) & CO₂
  2.    CO₂ & H₂
  3.    CO & O₂
  4.    CO₂ & O₂
 Discuss Question
Answer: Option A. -> CO (upto 65%) & CO₂
Question 215. Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.
  1.    80 and 97
  2.    95 and 100
  3.    40 and 70
  4.    25 and 97
 Discuss Question
Answer: Option A. -> 80 and 97
Question 216. Which of the following fuel gases is heavier than air?
  1.    Blast furnace gas
  2.    Coke oven gas
  3.    Natural gas
  4.    Water gas
 Discuss Question
Answer: Option A. -> Blast furnace gas
Question 217. As the equilibrium moisture content of the coal increases, its
  1.    Calorific value increases
  2.    Swelling number decreases
  3.    Swelling number increases
  4.    Bulk density decreases
 Discuss Question
Answer: Option B. -> Swelling number decreases
Question 218. Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
  1.    Higher calorific value
  2.    Lower hydrogen content
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option D. -> Neither A nor B
Question 219. One kg of carbon for theoretically complete combustion requires __________ kg of air.
  1.    11.5
  2.    0.5
  3.    23
  4.    12
 Discuss Question
Answer: Option A. -> 11.5
Question 220. Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.
  1.    1kg mole
  2.    22.4 Nm³
  3.    32 kg
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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