Mass Transfer problems
- 1. Which is the controlling factor for a drum drier?
Options- A. Diffusion
- B. Heat transfer
- C. Both (a) and (b)
- D. Neither (a) nor (b) Discuss
Correct Answer: Heat transfer
- 2. When the temperature and humidity of air is low, we usually use __________ draft cooling tower.
Options- A. natural
- B. forced
- C. induced
- D. none of these Discuss
Correct Answer: natural
- 3. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
Options- A. chemical properties
- B. physical properties
- C. degree of turbulence
- D. interfacial area Discuss
Correct Answer: chemical properties
- 4. With increase in pressure, the relative volatility for a binary system
Options- A. increases.
- B. decreases.
- C. remains same.
- D. either (a) or (b), depends on the system. Discuss
Correct Answer: decreases.
- 5. In batch distillation with constant reflux, overhead product composition __________ with time.
Options- A. increases
- B. decreases
- C. does not vary
- D. may increase on decrease, depends on the system. Discuss
Correct Answer: decreases
- 6. Overall efficiency of the distillation column is
Options- A. the ratio of number of ideal plates to actual plates.
- B. the ratio of number of actual plates to ideal plates.
- C. same as the Murphree efficiency.
- D. always more than the point efficiency. Discuss
Correct Answer: the ratio of number of ideal plates to actual plates.
- 7. Which of the following unit operations makes use of Thiele-Geddes equation?
Options- A. Liquid-liquid extraction
- B. Solid-liquid extraction
- C. Multicomponent absorption with chemical reaction
- D. Multicomponent distillation. Discuss
Correct Answer: Multicomponent distillation.
- 8. The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is
Options- A. natural draft cooling tower
- B. induced draft cooling tower
- C. spray chamber
- D. none of these Discuss
Correct Answer: spray chamber
- 9. As the reflux ratio in a distillation coloumn is increased from the minimum, the
Options- A. slope of the operating line in stripping section decreases.
- B. number of plates decreases very slowly first and then more and more rapidly.
- C. total cost first decreases and then increases.
- D. liquid flow increases while the vapor flow decreases for a system. Discuss
Correct Answer: total cost first decreases and then increases.
- 10. Total reflux in a distillation operation requires minimum
Options- A. reboiler load
- B. number of plates
- C. condenser load
- D. all (a), (b) and (c) Discuss
Correct Answer: number of plates
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