Mass Transfer problems
- 1. Which of the following is the most suitable for extraction in a system having very low density difference?
Options- A. Mixer-settler extractor
- B. Centrifugal extractor
- C. Pulsed extractor
- D. Packed extraction tower Discuss
Correct Answer: Centrifugal extractor
- 2. Low viscosity absorbent is preferred for reasons of
Options- A. rapid absorption rates and good heat transfer characteristics.
- B. improved flooding characteristics.
- C. low pressure drop on pumping.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 3. Raoult's law applies to the
Options- A. all liquid solutions
- B. non-ideal solution only.
- C. non-volatile solute.
- D. solvents. Discuss
Correct Answer: solvents.
- 4. Which of the following quantities need not be fixed before starting the design of a co-current absorber?
Options- A. Heat gain or loss
- B. Flow rate of entering liquid
- C. Flow rate of gas
- D. None of these Discuss
Correct Answer: Flow rate of entering liquid
- 5. Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
Options- A. electrical resistance
- B. thermal conductivity
- C. strength
- D. none of these. Discuss
Correct Answer: electrical resistance
- 6. Absorption accompanied with chemical reaction is exemplified by the absorption of
Options- A. ammonia in water.
- B. benzol present in coke oven gas by wash oil.
- C. SO2 in alkaline solution.
- D. all (a), (b) and (c). Discuss
Correct Answer: SO2 in alkaline solution.
- 7. Physical absorption is
Options- A. an irreversible phenomenon.
- B. a reversible phenomenon.
- C. accompanied by evolution of heat.
- D. both (b) and (c) Discuss
Correct Answer: both (b) and (c)
- 8. In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.
Options- A. increases with increase in
- B. is one at unity value of
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) and (b)
- 9. Make up water is required in a cooling tower to replace the water lost by
Options- A. evaporation
- B. drift
- C. blowdown and leakage
- D. all (a), (b) and (c) Discuss
Correct Answer: all (a), (b) and (c)
- 10. Pick out the correct statement.
Options- A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
- B. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
- C. The selectivity of solvent used in solvent extraction is unity at the plait point.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
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