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MCQs

Total Questions : 2441 | Page 5 of 245 pages
Question 41. If oxygen content in the flue gas rises too high, fuel is being wasted by
  1.    Incomplete combustion
  2.    Dry gas/stack gas loss
  3.    Moisture loss
  4.    None of these
 Discuss Question
Answer: Option B. -> Dry gas/stack gas loss
Question 42. Coking time in beehive coke oven is about
  1.    12 hours
  2.    2-3 days
  3.    One week
  4.    Two weeks
 Discuss Question
Answer: Option B. -> 2-3 days
Question 43. Too much of excess air in combustion results in high
  1.    Fuel consumption for the same heat load
  2.    Stack gas temperature
  3.    Percentage of oxygen in flue gases
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 44. The cuprous chloride used in orsat apparatus can absorb
  1.    Only CO
  2.    Both CO and CO₂
  3.    Both CO and O₂
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 45. Catalyst used in Fischer-Tropsch process is
  1.    Nickel
  2.    Zinc oxide
  3.    Alumina
  4.    Thorium oxide
 Discuss Question
Answer: Option A. -> Nickel
Question 46. Pick out the wrong statement.
  1.    Cokes of high reactivity are obtained from weakly coking coals
  2.    Cokes of high reactivity are obtained from strongly coking coals
  3.    Reactivity of coke is inversely proportional to its absolute density
  4.    Abrasion index of the coke is a measure of its hardness
 Discuss Question
Answer: Option B. -> Cokes of high reactivity are obtained from strongly coking coals
Question 47. The pyragallol solution used in orsat apparatus can absorb
  1.    Only O₂
  2.    Both O₂ and CO₂
  3.    Both O₂ and CO
  4.    All of the above
 Discuss Question
Answer: Option B. -> Both O₂ and CO₂
Question 48. Use of preheated air for combustion of fuel in the furnace, increases the
  1.    Scale losses of the furnace stock
  2.    Calorific value of the fuel
  3.    Flame temperature
  4.    None of these
 Discuss Question
Answer: Option C. -> Flame temperature
Question 49. C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.
  1.    Decreases
  2.    Increases
  3.    Remains constant
  4.    May increase or decrease, depends on combustibles
 Discuss Question
Answer: Option D. -> May increase or decrease, depends on combustibles
Question 50. 'Wobbe index' is a characteristic of
  1.    Solid fuels
  2.    Gaseous fuels
  3.    Liquid fuels
  4.    Fat coals
 Discuss Question
Answer: Option B. -> Gaseous fuels

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