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- Question
Stefan's law describes the mass transfer by
Options- A. diffusion
- B. bulk flow
- C. both 'a' & 'b'
- D. neither 'a' nor 'b'
- Correct Answer
- both 'a' & 'b'
- 1. Fenske equation determines the
Options- A. maximum number of ideal plates.
- B. height of the distillation column.
- C. minimum number of theoretical plates.
- D. optimum reflux ratio. Discuss
- 2. Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
Options- A. K ? D
- B. K ?D
- C. K ? D1.5
- D. K ? D2 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. At minimum reflux ratio for a given separation
Options- A. number of plates is zero.
- B. number of plates is infinity.
- C. minimum number of the theoretical plates is required.
- D. separation is most efficient. Discuss
- 7. Relative humidity is the ratio of the
Options- A. partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
- B. partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
- C. actual humidity to saturation humidity.
- D. none of these Discuss
- 8. Separation of two or more components of a liquid solution can not be achieved by
Options- A. fractional crystallisation
- B. liquid extraction
- C. absorption
- D. evaporation Discuss
- 9. Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty?
Options- A. Sieve plate column
- B. Bubble cap column
- C. Randomly packed column
- D. Wetted wall column Discuss
- 10. In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
Options- A. 0.50
- B. 0.60
- C. 2
- D. 1 Discuss
Mass Transfer problems
Search Results
Correct Answer: minimum number of theoretical plates.
Correct Answer: K ? D
Correct Answer: all (a), (b) and (c).
Correct Answer: all (a), (b) and (c)
Correct Answer: both (a) and (b)
Correct Answer: number of plates is infinity.
Correct Answer: partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
Correct Answer: absorption
Correct Answer: Wetted wall column
Correct Answer: 0.50
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