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 ?

Related Mcqs:

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

   A. Greater than
   B. Smaller than
   C. Equal to
   D. Either A., or B.; depends on the type of packing

2. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG ______________ the absorption factor?

   A. Increases with increase in
   B. Is one at unity value of
   C. Both A. and B.
   D. Neither A. nor B.

3. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?

   A. Is greater than
   B. Is lower than
   C. Is same as
   D. Cannot be predicted as data are insufficient

4. Channelling in a packed tower results from the_____________________?

   A. High pressure drop
   B. Maldistribution of liquid
   C. Non-uniformity of packing
   D. Both B. and C.

5. In a packed bed absorption column, the channelling will be noted by the ____________________?

   A. Increase in flow rate
   B. Sharp drop in pressure drop
   C. Sharp rise in pressure drop
   D. None of these

6. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?

   A. Size
   B. Durability
   C. Porosity
   D. Cost

7. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?

   A. Size
   B. Durability
   C. Porosity
   D. Cost

8. 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

9. The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?

   A. Low pressure drop and high hold up
   B. High pressure drop and low hold up
   C. Low pressure drop and low hold up
   D. High pressure drop and high hold up

10. A packed tower compared to a plate tower for a particular mass transfer operation__________________?

    A. Incurs smaller pressure drop
    B. Allows installation of cooling coils
    C. Is less costly when built in large sizes/diameters
    D. Is more suitable, if suspended solids are present in fluid streams