Mass Transfer problems
- 1. 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
Correct Answer: K ? D
- 2. 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
Correct Answer: minimum number of theoretical plates.
- 3. Stefan's law describes the mass transfer by
Options- A. diffusion
- B. bulk flow
- C. both 'a' & 'b'
- D. neither 'a' nor 'b' Discuss
Correct Answer: both 'a' & 'b'
- 4. 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
Correct Answer: number of plates is infinity.
- 5. 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
Correct Answer: partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
- 6. 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
Correct Answer: absorption
- 7. 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
Correct Answer: Wetted wall column
- 8. 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
Correct Answer: 0.50
- 9. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
Options- A. raising the temperature.
- B. lowering the total pressure.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
Correct Answer: both (a) and (b).
- 10. Chemisorption (chemical adsorption) is
Options- A. same as "Van der Waals" adsorption.
- B. characterised by adsorption of heat.
- C. an irreversible phenomenon.
- D. a reversible phenomenon. Discuss
Correct Answer: an irreversible phenomenon.
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