Basic Practice Questions Mass Transfer - Set 35 - ObjectiveBooks

Basic Practice Questions Mass Transfer - Set 35

Practice Test: Question Set - 35

1. Which of the following is an undesirable property for an absorbing solvent?
    (A) Low vapor pressure
    (B) Low velocity
    (C) Low freezing point
    (D) None of these

2. Stacked packing compared to dumped packing
    (A) Provides poorer contact between the fluids
    (B) Gives lower pressure drop
    (C) Both (a) and (b)
    (D) Gives higher pressure drop

3. Raoult's law applies to the
    (A) All liquid solutions
    (B) Non-ideal solution only
    (C) Non-volatile solute
    (D) Solvents

4. __________ developed the film theory.
    (A) Higbie
    (B) Fick
    (C) Ergun
    (D) Levenspiel

5. Hydrogenation of oil is carried out in a/an __________ in Vanaspati manufacturing plant.
    (A) Agitated vessel
    (B) Sieve tray column
    (C) Bubble cap column
    (D) Packed tower

6. Schmidt number is given by
    (A) µ/ρDAB
    (B) Re × Pe
    (C) Sh × Pe
    (D) Re/Pe

7. Pick out the correct statement.
    (A) Diffusivity decreases with increase in temperature
    (B) Diffusivity increases with increase in molecular weight
    (C) Diffusivity increases with the size of the individual molecule
    (D) None of these

8. Fenske equation determines the
    (A) Maximum number of ideal plates
    (B) Height of the distillation column
    (C) Minimum number of theoretical plates
    (D) Optimum reflux ratio

9. If xD = overhead product molal composition and RD = reflux ratio, then slope and intercept of the operating line for rectifying section are respectively
    (A) [xD/(RD + 1)], [RD/(RD + 1)]
    (B) [RD/(RD + 1)], [xD/(xD + 1)]
    (C) [xD/(RD + 1)], [(RD + 1)/RD]
    (D) None of these

10. Which of the following equipments is not used for gas dispersion?
    (A) Agitated vessels
    (B) Bubble cap tray towers
    (C) Perforated sieve tray towers
    (D) Spray towers

11. __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
    (A) Wetted wall
    (B) Packed
    (C) Plate
    (D) Spray

12. When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
    (A) Always lower than
    (B) Always higher than
    (C) Same as
    (D) Dependent on the system; can be either lower or higher than

13. On addition of solute in the solvent, the __________ of the solution decreases.
    (A) Boiling point
    (B) Freezing point
    (C) Vapor pressure
    (D) Both (b) and (c)

14. Extraction of penicillin employs a __________ extraction column.
    (A) Centrifugal
    (B) Packed
    (C) Plate
    (D) None of these

15. Which of these columns incurs the lowest pressure drop?
    (A) Packed column (with stacked packing)
    (B) Packed column (with dumped packing)
    (C) Bubble plate column
    (D) Pulse column

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