Gate Exam Paper Mass Transfer - Set 12 - ObjectiveBooks
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Gate Exam Paper Mass Transfer - Set 12

Practice Test: Question Set - 12


1. Reverse osmosis is also called
    (A) Dialysis
    (B) Electrodialysis
    (C) Diffusion
    (D) Ultra-filtration

2. Design calculation for multiple component distillation is done by
    (A) Ponchon-Savarit method
    (B) McCabe-Thiele method
    (C) Enthalpy concentration method
    (D) Tray to tray calculations

3. Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in
    (A) Decreased solute solubility
    (B) Large minimum liquid to gas (L/G) ratio
    (C) Large number of trays
    (D) All (a), (b) and (c)

4. The unit of volumetric diffusivity is
    (A) cm2/sec
    (B) cm/sec
    (C) cm3/sec
    (D) cm2/sec2

5. Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant
    (A) Humidity
    (B) Velocity
    (C) Temperature
    (D) All (a), (b) & (c)

6. The diffusivity (D) in a binary gas mixture is related to the pressure (P) as
    (A) D  P0.5
    (B) D  1/P0.5
    (C) D  1/P
    (D) D  1/P1.5

7. In liquid extraction, if the selectivity is unity, then
    (A) Separation of the constituents is the most effective
    (B) No separation will occur
    (C) Amount of solvent required will be minimum
    (D) Solvent flow rate should be very low

8. Can the efficiency of a plate in the distillation tower be greater than 100%?
    (A) Yes
    (B) Normally not; but is possible if infinite number of plates are put
    (C) Never
    (D) Yes; if the reflux ratio is maximum

9. H2S present in naphtha reformed gas is removed by absorbing with
    (A) Ethanolamine
    (B) K2CO3
    (C) HCl
    (D) Vacuum gas oil

10. Dorr thickener is an equipment used for
    (A) Classification
    (B) Sedimentation
    (C) Clarification
    (D) Leaching

11. With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent
    (A) Increases
    (B) Decreases
    (C) Remain same
    (D) Either (a) or (b), depends on the system

12. Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.
    (A) Film
    (B) Penetration
    (C) Surface-renewal
    (D) None of these

13. A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is:
    (A) 0.54
    (B) 1.04
    (C) 1.24
    (D) 1.94

14. __________ extractor uses centrifugal force for separating the two phases.
    (A) Treybal
    (B) Scheibel
    (C) Podbielniak
    (D) None of these

15. With increase in temperature, the mutual solubility of two liquids
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Decreases exponentially

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