The main reason for dividing a tall packed tower into series of small towers is to________________________?

Related Mcqs:

1. 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

2. Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the____________________?

   A. Packing may be crushed due to thermal expansion/contraction of the components of the
   equipments
   B. Pressure drop in the equipment will be very high
   C. Viscosity variation of the fluids may cause channelling/flooding
   D. None of these

3. Very tall packed towers are divided into series of beds to___________________?

   A. Reduce the overall pressure drop
   B. Avoid channelling
   C. Reduce liquid hold-up
   D. Avoid flooding

4. 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

5. Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________?

   A. Less
   B. More
   C. Equal
   D. Either A. or B.; depends on the packing height

6. 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

7. 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

8. Use of packed towers for distillation is generally limited to the__________________?

   A. Small sizes
   B. Multi-component distillation
   C. High pressure operation
   D. Vacuum distillation

9. Use of packed towers for distillation is generally limited to the____________________?

   A. Small sizes
   B. Multi-component distillation
   C. High pressure operation
   D. Vacuum distillation

10. In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalent to a theoretical plate HTUOG = overall gas phase height of a transfer unit) ?

    A. Straight
    B. Parallel
    C. Both A. & B.
    D. Neither A. nor B.