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

Related Mcqs:

1. 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

2. 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

3. 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

4. Which of the following is not fixed by the process requirements, in the design of absorbers ?

   A. Flow rate of the entering gas
   B. Composition of the entering liquid
   C. Terminal concentrations of gas stream
   D. None of these

5. Co-current absorbers are usually used when the gas to be dissolved in the liquid is ___________________?

   A. Sparingly soluble
   B. Highly soluble
   C. A pure substance
   D. A mixture

6. For absorbers, high pressure drop results in___________________?

   A. Increased efficiency
   B. Decreased efficiency
   C. High operating cost
   D. Better gas liquid contact

7. Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation ?

   A. Cost
   B. Availability
   C. Toxicity
   D. Selectivity

8. Which of the following is an undesirable property in a tower packing ?

   A. Large surface per unit volume
   B. Large free cross-section
   C. Low weight per unit volume
   D. Large weight of liquid retained

9. 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

10. An ideal tower packing should not _______________________?

    A. Have low weight per unit volume
    B. Have large surface area per unit volume
    C. Have large free cross-section
    D. Hold up large amount of liquid in the packing