“Introduction to Process Modeling in Membrane Separation Process” Solution Set ##Assignment-1

1. Name one separation process that requires energy input to the system. (a) Coagulation, (b) Adsorption, (c) Distillation, (d) Flocculation. 2. What is the driving force of mass transfer? (a) Potential energy difference, (b) Pressure gradient, (c) Gradient of electrochemical potential, (d) Gradient of chemical potential. 3. For no separation, what is the value of separation factor? (a) Separation factor = 0, (b) Separation factor = 1, (c) Separation factor > 1, (d) Separation factor < 1. 4. What is a typical characteristic of symmetric membrane? (a) Material is same with uniform porosity, (b) Material is same, (c) Material is different with heterogeneous porosity, (d) Material is different with thick skin at surface. 5. What is the relationship between observed and real retention? (a) Real retention = observed retention, (b) Real retention > observed retention, (c) Real retention < observed retention, (d) None of the above. 6. What is the Constant for Fick’s Law? (a) R, (b) K, (c) D, (d) None of the above.

7. Name one rate governed separation processes. (a) Reverse osmosis, (b) Distillation, (c) Absorption, (d) Adsorption. 8. Absorption is a ________ phenomena. (a) Surface, (b) Bulk, (c) Both surface & bulk, (d) None of the above. 9. What is the unit of Diffusivity? (a) m2/s, (b) m/s, (c) m/Pa.s, (d) None of the above. 10. What is the unit of Permeability? (a) m2/s, (b) m/s, (c) m/Pa.s, (d) None of the above.

11. Osmotic pressure is a ____________ property. (a) Electro-chemical, (b) Colligative, (c) Physical, (d) Chemical. 12. When real retention equals to observed retention? (a) High polarization condition, (b) High feed concentration, (c) Low polarization condition, (d) Not possible.

13. What is the pore size range in case of Reverse osmosis? (a) 2-10 Å, (b) 10-20 Å, (c) 20-1000 Å, (d) >1000 Å. 14. What is the transport mechanism for Microfiltration process? (a) Diffusion, (b) Convection, (c) Permeation, (d) Adsorption. 15. Name one typical application for Ultrafiltration? (a) Desalination, (b) Dye Separation, (c) Protein separation, (d) Clay Separation.

Coagulation, (b) Adsorption, (c) Distillation - nptel

##Assignment-1. 1. Name one separation process that requires energy input to the system. (a) Coagulation, (b) Adsorption, (c) Distillation, (d) Flocculation. 2.
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