Plate efficiency in a distillation column is reduced due to the ______________________ of liquid?

Related Mcqs:

1. Plate efficiency in a distillation column is reduced due to the ______________ of liquid?

   A. Entrainment
   B. Foaming
   C. Weeping & dumping
   D. All A., B. & C.

2. The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?

   A. Across
   B. Above
   C. Both A. & B.
   D. Neither A. nor B.

3. The ratio of Murphree plate efficiency to point efficiency is 1 in a ______________________ flow model?

   A. Plug
   B. Perfectly mixed
   C. Both A. & B.
   D. Neither A. nor B.

4. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?

   A. Total
   B. Minimum
   C. Operating
   D. Maximum permissible

5. Can the efficiency of a plate in the distillation tower be greater than 100% ?

   A. Yes
   B. Normally not; but is possible if infinite number of plates are put
   C. Never
   D. Yes; if the reflux ratio is maximum

6. Can the efficiency of a plate in the distillation tower be greater than 100% ?

   A. Yes
   B. Normally not; but is possible if infinite number of plates are put
   C. Never
   D. Yes; if the reflux ratio is maximum

7. In a distillation column, with increase in the reflux ratio, the heat removed in the cooler ______________________?

   A. Increases
   B. Decreases
   C. Remains unaffected
   D. And the heat required in reboiler decreases

8. According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column ?

   A. 5
   B. 9
   C. 12
   D. 28

9. Packed column distillation is limited to the column _____________ metres?

   A. Height < 6
   B. Diameter < 0.6
   C. Both A. & B.
   D. Neither A. nor B.

10. A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?

    A. Composition of vapors and that of liquid do not vary throughout the column
    B. Reboiler load and condenser load are minimum
    C. The top and bottom compositions are unchanged with and without total reflux
    D. The top and bottom compositions correspond to the maximum enrichment available