In an absorption column, the flooding velocity for random packing is ___________________ that for stacked/regular packing?

Related Mcqs:

1. In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?

   A. > 4 :1
   B. < 8 : 1
   C. > 8:1
   D. < 6:1

2. Stacked packing compared to dumped packing_________________?

   A. Provides poorer contact between the fluids
   B. Gives lower pressure drop
   C. Both A. and B.
   D. Gives higher pressure drop

3. Flooding in a distillation column is detected by a sharp ___________________?

   A. Increase in Murphree plate efficiency
   B. Decrease in pressure drop
   C. Decrease in liquid hold up in the column
   D. Increase in pressure drop

4. Operating velocity in a packed tower is usually __________________ the flooding velocity ?

   A. Half
   B. Twice
   C. Equal to
   D. More than

5. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency___________________?

   A. Liquid stream should be distributed uniformly
   B. Gas stream should be distributed uniformly
   C. Both gas as well as liquid streams should be distributed uniformly
   D. By passing should be completely avoided

6. In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________?

   A. Liquid stream should be distributed uniformly
   B. Gas stream should be distributed uniformly
   C. Both gas as well as liquid streams should be distributed uniformly
   D. By passing should be completely avoided
   Answer: Option C

7. Flooding in a column results due to___________________?

   A. High pressure drop
   B. Low pressure drop
   C. Low velocity of the liquid
   D. High temperature

8. With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

   A. Decreases
   B. Remains unchanged
   C. Increases
   D. Decreases exponentially

9. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

   A. G/(FG . a)
   B. FG/(G . a)
   C. (G . a)/FG
   D. L/(FG . G)

10. Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be_________________?

    A. 1
    B. > 1
    C. < 1
    D. ≤ 1