Important Questions and Answers - Mass Transfer - Set 28 - ObjectiveBooks
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# Practice Test: Question Set - 28

1. The expression, ln(F/W) = ∫xFxW [dx/y* - x)] is
(A) Differential distillation equation
(B) For NtoG in absorption for dilute mixture
(C) Slope of q-line in McCabe-Thiele method
(D) For relative volatility

2. Wetted wall tower experiment determines the
(A) Molal diffusivity
(B) Volumetric co-efficient
(C) Mass transfer co-efficient
(D) None of these

3. Condensation of a vapor-gas mixture just begins, when (where, p = partial pressure of the vapor P = vapor pressure of the liquid).
(A) p = P
(B) p >>P
(C) p < P
(D) p << P

4. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are:
(A) Straight
(B) Parallel
(C) Both (a) & (b)
(D) Neither (a) nor (b)

5. JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
(A) Nsh = 2
(B) Nst = 2
(C) Nsc = 2
(D) None of these

6. In liquid-liquid extraction, the number of phases at plait point is
(A) 1
(B) 2
(C) 3
(D) 4

7. Molecular sieves are porous
(A) Alumina
(B) Silica
(C) Synthetic zeolites crystals/metal alumino-silicates
(D) None of these

8. Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off __________ °C.
(A) At < 100
(B) At > 210.6
(C) Between 100 and 210
(D) None of these

9. Selectivity of the solvent used in solvent extraction should be
(A) 1
(B) > 1
(C) < 1
(D) 0

10. The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
(A) Temperature rises
(B) Pressure rises
(C) Temperature falls
(D) Pressure falls

11. The dew point of a saturated gas phase equals the __________ temperature.
(A) Gas
(B) Room
(C) Wet bulb
(D) None of these

12. The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by
(A) Raising the temperature
(B) Lowering the total pressure
(C) Both (a) and (b)
(D) Neither (a) nor (b)

13. Priming in a distillation column
(A) Results from very low gas velocity
(B) Is desirable from point efficiency consideration
(C) Is characterized by the presence of foam throughout the space between trays
(D) Reduces the overall pressure drop

14. Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their
(A) Viscosity
(B) Density
(C) Solubility
(D) Relative volatility

15. The efficiency of a plate column will be maximum, when the flow is ideal __________ the plate.
(A) Across
(B) Above
(C) Both (a) & (b)
(D) Neither (a) nor (b)

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