Gas Absorption(Mass Transfer ) Questions and Answers

Question 1. Packing height in the packed tower = NTU x __________
  1.    HTU
  2.    HETP
  3.    NTU
  4.    HETP + HTU
Explanation:-
Answer: Option B. -> HETP
Answer: (b).HETP
Question 2. Find the absorption tower height if
Number of gas phase transfer units 4.09
Height of gas phase transfer units 1.5 meters
  1.    2.72 meters
  2.    0.36 meters
  3.    6.135 meters
  4.    None of the mentioned
Explanation:-
Answer: Option C. -> 6.135 meters
Answer: (c).6.135 meters
Question 3. Will the Height equivalent theoretical plates changes with flow rates?
  1.    Yes
  2.    No
  3.    May be Yes or No
  4.    Can't say
Explanation:-
Answer: Option A. -> Yes
Answer: (a).Yes
Question 4. Find the HTU if gas rate is 0.07 kmol/sq.m s and the Fg* a ( F type mass transfer co-efficient) is 0.06 kmol/ cu.m s.
  1.    1.167
  2.    0.85
  3.    0.042
  4.    None of the mentioned
Explanation:-
Answer: Option A. -> 1.167
Answer: (a).1.167
Question 5. Kremser brown equation will be invalid for gas phase transfer units if operating and equilibrium line has same slope.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option A. -> True
Answer: (a).True
Question 6. Spray tower is a _______ process.
  1.    Co-current
  2.    Counter current
  3.    Continuous
  4.    Batch
Explanation:-
Answer: Option B. -> Counter current
Answer: (b).Counter current
Question 7. In an absorber, lower denser materials are sent through the bottom and the higher denser materials are sent through top.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option A. -> True
Answer: (a).True
Question 8. Find the rate of non-diffusing solute, if the mole fraction of the gas phase is 0.65 and the diffusing rate is 70 moles/hr.
  1.    24.5 moles/hr
  2.    200 moles/hr
  3.    18.18 moles/hr
  4.    37.7 moles/hr
Explanation:-
Answer: Option A. -> 24.5 moles/hr
Answer: (a).24.5 moles/hr
Question 9. If the operating line touches the equilibrium line, the separation is possible in an absorber.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
Explanation:-
Answer: Option B. -> False
Answer: (b).False
Question 10. Stripper= (1/X)
Find X?
  1.    Condenser
  2.    Reboiler
  3.    Absorber
  4.    Sprayer
Explanation:-
Answer: Option C. -> Absorber
Answer: (c).Absorber
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