Mass Transfer in Different Phases MCQ Practice Test - Set 37 - ObjectiveBooks
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Mass Transfer in Different Phases MCQ Practice Test - Set 37

Practice Test: Question Set - 37


1. Channelling in a packed tower results from the
    (A) High pressure drop
    (B) Maldistribution of liquid
    (C) Non-uniformity of packing
    (D) Both (b) and (c)

2. Which of the following adsorbent is used in the refining of sugar?
    (A) Bone charcoal
    (B) Wood charcoal
    (C) Silica gel
    (D) Activated clay

3. With increase in pressure, the relative volatility for a binary system
    (A) Increases
    (B) Decreases
    (C) Remains same
    (D) Either (a) or (b), depends on the system

4. When the liquid over a plate is of uniform concentration, then
    (A) Murphree efficiency > point efficiency
    (B) Murphree efficiency < point efficiency
    (C) Murphree efficiency = point efficiency
    (D) Murphree efficiency ≠ point efficiency

5. Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when
    (A) Extracting solvent is cheaply & abundantly available
    (B) One of the liquid components is heat sensitive
    (C) Viscosity of liquid components is very high
    (D) One of the liquid components has very high affinity towards the solvent

6. A good solvent used for absorption should not have very high
    (A) Viscosity
    (B) Vapor pressure
    (C) Freezing point
    (D) All (a), (b) & (c)

7. An example of elution is
    (A) Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank
    (B) Separation of sugar from sugar beet by hot water
    (C) Dissolution of tannin out of tree barks by water
    (D) Recovery of vegetable oils from seeds

8. The term "cooling range" in a cooling tower refers to the difference in the temperature of
    (A) Cold water leaving the tower and the wet bulb temperature of the surrounding air
    (B) Hot water entering the tower and the wet bulb temperature of the surrounding air
    (C) Hot water entering the tower and the cooled water leaving the tower
    (D) None of these

9. If the amount of the steam used in steam distillation is increased, the temperature of distillation
    (A) Increases
    (B) Decreases
    (C) Remains unchanged
    (D) Depends on relative volatility

10. Rate of leaching increases with increasing
    (A) Temperature
    (B) Viscosity of solvent
    (C) Pressure
    (D) Size of the solid

11. With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent
    (A) Increases
    (B) Decreases
    (C) Decreases linearly
    (D) Remains unaffected

12. Heat load in a cooling tower
    (A) Means the amount of heat thrown away (KCal/hr.) by the cooling tower
    (B) Is equal to the number of kg, of water circulated times the cooling range
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

13. Separation of two or more components of a liquid solution cannot be achieved by
    (A) Fractional crystallization
    (B) Liquid extraction
    (C) Absorption
    (D) Evaporation

14. For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
    (A) Unsaturated surface
    (B) Constant rate
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

15. In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as
    (A) Ri = Re/(1 - Re)
    (B) Ri = (1 - Re)/Re
    (C) Ri = Re
    (D) Ri = Re/(1 + Re)

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