One Word / One Line Questions
1. Which adsorbent is commonly used in refining of sugar?
2. What is the unit of volumetric diffusivity?
3. Give full form of HETP
4. Give full form of NTU
5. What is the driving force for mass transfer?
6. Define specific heat.
7. Define latent heat
8. What is the best separation technique for the mixture of two immiscible liquids?
9. What is the reverse process of absorption called?
10. Give one important consideration in the selection of packing for absorber.
11. Give one undesirable property of tower packing.
12. What is stacked packing?
13. What is net rate of diffusion at equilibrium conditions?
14. What is eddy diffusion?
15. What is sublimation?
16. Give one factor on which the mass transfer rate between two fluid phases depend?
17. What happens to the rate of leaching with increase in temperature?
18. Which law is obeyed by the ideal solutions?
19. What happens to the rate of diffusion if turbulence is created?
20. Give full form of HETP.
21. Which adsorbent is commonly used for refining of sugar?
22. Define specific heat.
23. Give one undesirable property of tower packing.
24. What is sublimation?
25. What is net rate of diffusion at equilibrium conditions?
26. What is the reverse process of absorption called?
27. Define latent heat
28. Give full form of NTU
29. What is the unit of volumetric diffusivity?
30. What is stacked packing?
31. Leaching is __________ effective at higher temperatures generally.
32. Transfer of a solute from a gas mixture to a solvent is known as __________.
33. HETP stands for __________.
34. Stripping operation means __________ process.
35. Ideal solution obeys __________ law.
36. NTU stands for __________.
37. Diffusion occurs as a result of the random thermal movement of __________.
38. Wet bulb temperature is always __________ than dry bulb temperature.
39. __________ is the temperature at which a vapor-gas mixture becomes saturated when cooled at
constant total pressure out of contact with liquid.
40. A good solvent for extraction must have __________ selectivity.
41. An important consideration in selection of packings for absorber is __________.
42. For very high purity product __________ number of transfer units will be required.
43. The freezing point of the solvent used in absorption operation should be __________.
44. Solvent rich phase in extraction operation is called __________.
45. The driving force for mass transfer is __________ difference.
Short Answer Type Questions:-
1. Explain diffusion and its types.
2. Discuss briefly film theory of mass transfer.
3. Give different factors affecting choice of solvent for absorption.
4. State Henry’s Law and Raoult’s Law.
5. Explain the terms dry bulb and wet bulb temperatures.
6. Define relative humidity and humid heat.
7. Define leaching and extraction.
8. What do you mean by inter-phase mass transfer?
9. Differentiate between distillation and extraction.
10. Give one factor on which the mass transfer rate between two fluid phases depend?
11. What happens to the rate of leaching with increase in temperature?
12. Which law is obeyed by the ideal solutions?
13. What happens to the rate of diffusion if turbulence is created?
14. Give full form of HETP.
15. Which adsorbent is commonly used for refining of sugar?
16. Define specific heat.
17. Give one undesirable property of tower packing.
18. What is sublimation?
19. What is net rate of diffusion at equilibrium conditions?
20. What is the reverse process of absorption called?
21. Define latent heat
22. Give full form of NTU
23. What is the unit of volumetric diffusivity?
24. What is stacked packing?
25. Give some essential characteristics of a good absorbent.
26. Explain the terms dry bulb and wet bulb temperatures.
27. Explain diffusion and its types.
28. Discuss briefly penetration theory of mass transfer.
29. Give importance of leaching in industry.
30. State the desirable characteristics tower packings.
31. Explain the terms channeling and weeping.
32. State and Explain Fick’s first law of diffusion with mathematical expression.
33. Explain Absorption and give its few applications.
Long Answer Type Questions
1. In an oxygen-nitrogen gas mixture at 101.3 kPa and 298 K, the concentrations of oxygen at
two phases 2 mm apart are 10% and 20% by volume respectively. Calculate the flux of
diffusion of oxygen for the two cases where:
a. The nitrogen is non-diffusing.
b. There is equimolar counter diffusion of the two gases. Diffusivity of O2 in N2 is
1.81 x 10-5 m2/s.
2. Write short notes on
a. Importance of leaching in industry.
b. Spray Tower
3. What are packed towers and tower packing?
4. State the desirable characteristics tower packing.
5. With the help of neat sketch describe the construction and working of mixer settler extraction
system.
6. Explain the following:
a. Flooding
b. Channeling
c. Weeping
7. What are cooling towers? Explain different types of cooling tower arrangements with the help
of diagrams.
8. With the help of neat sketch describe the construction and working of Bollman extractor.
9. Explain cooling towers and give different types of cooling tower arrangements with the help of
diagrams.
10. Explain the construction and working of Tray Towers used for various gas-liquid operations.
11. With the help of neat sketch describe the construction and working of mixer settler extraction
system.
12. Write short notes on
1) Liquid Liquid Extraction.
2) Bubble Cap Trays & Seive Trays
3) Saturated Gas
4) Loading
5) Relative Humidity
6) Flooding
7) What are packed towers and tower packings?
8) State the desirable characteristics tower packing
9) Importance of leaching in industry.
10) Spray Tower
