Mass Transfer Operations MCQ pdf Practice Test - Set 15 - ObjectiveBooks

Mass Transfer Operations MCQ pdf Practice Test - Set 15

Practice Test: Question Set - 15

1. During constant rate period, the rate of drying decreases with the
    (A) Decrease in air temperature
    (B) Increase in air humidity
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

2. At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?
    (A) 90
    (B) 91.5
    (C) 95
    (D) 99

3. Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?
    (A) Partial condenser
    (B) Total condenser
    (C) Reboiler
    (D) Both (b) and (c)

4. Steam distillation is not recommended to be used, if the
    (A) Azeotropic mixture is to be separated and the final product is miscible with water
    (B) Liquids decompose, if distilled directly at atmospheric pressure
    (C) Material cannot be distilled by indirect heating even under low pressure, because of the high boiling temperature
    (D) Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

5. It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%).
    (A) 15 min
    (B) 51 min
    (C) 71 min
    (D) 94 min

6. Which of the following liquid temperature (T) vs. vapor-gas mixture enthalpy (H) diagram is valid for humidification operation?

7. In Azeotropic mixture, the equilibrium vapor composition is
    (A) More than liquid composition
    (B) Less than liquid composition
    (C) Same as liquid composition
    (D) Independent of pressure

8. In rectifying section of a continuous distillation column, the
    (A) Vapor is enriched with low boilers
    (B) Vapor is enriched with high boilers
    (C) Liquid is stripped of high boilers
    (D) None of these

9. The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives
    (A) Low pressure drop and high hold up
    (B) High pressure drop and low hold up
    (C) Low pressure drop and low hold up
    (D) High pressure drop and high hold up

10. Diameter of raschig rings used in packed tower in industry is normally around __________ inches.
    (A) 2
    (B) 8
    (C) 12
    (D) 18

11. The ratio of Murphree plate efficiency to point efficiency is 1 in a __________ flow model.
    (A) Plug
    (B) Perfectly mixed
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

12. Plate efficiency
    (A) Is a function of the mass transfer between liquid and vapour
    (B) Increases due to foaming
    (C) Increases due to liquid entrainment
    (D) Increases due to weeping and dumping of liquid

13. Weeping in a distillation column
    (A) Increases tray efficiency
    (B) Provides large interfacial surface for mass transfer
    (C) Results due to very high gas velocity
    (D) Results due to very low gas velocity

14. The expression, y(1 - x)/x(1 - y) is for
    (A) Absorption factor
    (B) Relative volatility
    (C) Selectivity
    (D) Murphree efficiency

15. The process employing desorption of the absorbed solute by a solvent is called
    (A) Elution
    (B) Osmosis
    (C) Reverse osmosis
    (D) Sublimation

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