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MCQs

Total Questions : 2441 | Page 1 of 245 pages
Question 1. Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases.
  1.    CO content
  2.    Dew point
  3.    CO₂ content
  4.    O₂ content
 Discuss Question
Answer: Option A. -> CO content
Question 2. Fusion point of coal ash generally varies from 1000 to 1700° C. Ash having fusion point less than __________ °C is liable to form clinker.
  1.    1100
  2.    1250
  3.    1350
  4.    1400
 Discuss Question
Answer: Option A. -> 1100
Question 3. High sulphur content in a fuel __________ of the flue gases.
  1.    Decreases the dew point
  2.    Increases the dew point
  3.    Reduces the combustion efficiency by limiting the permissible temperature reduction
  4.    Both B & C
 Discuss Question
Answer: Option D. -> Both B & C
Question 4. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
  1.    Entrained
  2.    Moving
  3.    Fixed
  4.    Fluidised
 Discuss Question
Answer: Option A. -> Entrained
Question 5. Coal tar fuel - 200 (CTF 200) is a mixture of
  1.    Pitch and creosote oil
  2.    Light oil and pitch
  3.    Anthracene and crecosote oil
  4.    Solar oil and pitch
 Discuss Question
Answer: Option A. -> Pitch and creosote oil
Question 6. Which of the following combustibles is absent in blast furnace gas?
  1.    H₂
  2.    CH₄
  3.    CO
  4.    None of these
 Discuss Question
Answer: Option B. -> CH₄
Question 7. Which of the following would require maximum amount of % excess air for complete combustion?
  1.    Coke oven gas
  2.    Furnace oil
  3.    Pulverised coal
  4.    Lump coal (fixed on chain grate)
 Discuss Question
Answer: Option D. -> Lump coal (fixed on chain grate)
Question 8. A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is
  1.    CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60
  2.    CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02
  3.    CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06
  4.    CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74
 Discuss Question
Answer: Option B. -> CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02
Question 9. Calorific value of gobar gas (containing CH₄ = 60% , H₂ = 10% ; CO₂ = 30%) may be about __________ Kcal/Nm³.
  1.    1800
  2.    3200
  3.    5400
  4.    10200
 Discuss Question
Answer: Option C. -> 5400
Question 10. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
  1.    1000
  2.    4000
  3.    6000
  4.    8000
 Discuss Question
Answer: Option B. -> 4000

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