Mass Transfer Question Paper Chemical Engineering - Set 31 - ObjectiveBooks

Mass Transfer Question Paper Chemical Engineering - Set 31

Practice Test: Question Set - 31

1. Equilibrium-moisture curves of different solids
    (A) Are different
    (B) Are same
    (C) Depend on the humidity of the gas
    (D) None of these

2. The caking of crystals can be prevented by
    (A) Maintaining high critical humidity
    (B) Maintaining low critical humidity
    (C) Coating the product with inert material
    (D) Both (a) and (c)

3. In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.
    (A) Total
    (B) Minimum
    (C) Operating
    (D) Maximum permissible

4. Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
    (A) K  D
    (B) K D
    (C) K  D1.5
    (D) K  D2

5. Steady state equimolal counter diffusion occurs in case of
    (A) Leaching
    (B) Absorption
    (C) Binary phase distillation
    (D) Liquid-liquid extraction

6. On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
    (A) Greater degree of separation with a fixed number of trays
    (B) Increased reboiler load
    (C) Increased reflux ratio
    (D) None of these

7. __________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.
    (A) Furfural
    (B) Benzol
    (C) Butyl acetate
    (D) Hexane

8. Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
    (A) Chemical properties
    (B) Physical properties
    (C) Degree of turbulence
    (D) Interfacial area

9. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
    (A) 0
    (B) 1
    (C) < 1
    (D) > 1

10. Which of the following solutions will follow Raoult's law most closely?
    (A) A solution of benzene, toluene and o-xylene
    (B) 35% solution of camphor in water
    (C) 35% solution of NH3 in water
    (D) A solution of polar organic compounds (not of homologue of a series)

11. For continuous drying of granular or crystalline material, the dryer used is the __________ dryer.
    (A) Tunnel
    (B) Tray
    (C) Rotary
    (D) None of these

12. Pick out the correct statement.
    (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)

13. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
    (A) Packed
    (B) Bubble
    (C) Spray
    (D) Tray

14. As complete saturation of an adsorbent is approached, the differential heat of adsorption approaches
    (A) That of normal condensation
    (B) Integral heat of adsorption
    (C) Zero
    (D) None of these

15. During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
    (A) Gas film
    (B) Liquid film
    (C) Liquid-gas interface
    (D) None of these

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