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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