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Engineering > Chemical Engineering

MASS TRANSFER MCQs

Total Questions : 2554

Page 1 of 256 pages
Question 1. A coalescer in a mixer-settler liquid-liquid extraction coloumn
  1.    Comprises of thin bed of substances of extended surface having high porosity
  2.    Helps in increasing the bubble size entering the settler
  3.    Helps in increasing the settling rate of the bubbles
  4.    All of the above
 Discuss Question
Answer is Option D. -> All of the above
Question 2. Tower diameter may be decreased by
  1.    Using higher reflux ratio
  2.    Use of increased tray spacing
  3.    Increasing the liquid flow rate
  4.    Increasing the vapour flow rate
 Discuss Question
Answer is Option B. -> Use of increased tray spacing
Question 3. Flash distillation is suitable for the separation of components
  1.    Having very close boiling points
  2.    Which form maximum boiling azeotrope
  3.    Having very wide boiling points
  4.    Which form minimum boiling azeotrope
 Discuss Question
Answer is Option C. -> Having very wide boiling points
Question 4. Make up water is required in a cooling tower to replace the water lost by
  1.    Evaporation
  2.    Drift
  3.    Blowdown and leakage
  4.    All of the above
 Discuss Question
Answer is Option D. -> All of the above
Question 5. In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
  1.    > 4 :1
  2.    < 8 : 1
  3.    > 8:1
  4.    < 6:1
 Discuss Question
Answer is Option C. -> > 8:1
Question 6. In an absorber, HETP does not vary with the
  1.    Flow rate of liquid
  2.    Flow rate of gas
  3.    Type and size of packing
  4.    None of these
 Discuss Question
Answer is Option D. -> None of these
Question 7. Use of natural draft cooling tower is practised, when the air has low
  1.    Humidity
  2.    Temperature
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer is Option C. -> Both A & B
Question 8. Raoult's law applies to the
  1.    All liquid solutions
  2.    Non-ideal solution only
  3.    Non-volatile solute
  4.    Solvents
 Discuss Question
Answer is Option D. -> Solvents
Question 9. The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
  1.    +ve
  2.    -ve
  3.    Zero
  4.    None of these
 Discuss Question
Answer is Option A. -> +ve
Question 10. Which of the following can be calculated theoretically using steam table and Dalton's law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known?
  1.    Dew point
  2.    Humidity ratio
  3.    Wet bulb temperature
  4.    None of these
 Discuss Question
Answer is Option C. -> Wet bulb temperature
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Sub Topics

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