Mass Transfer Objective Questions pdf Online Test - Set 16 - ObjectiveBooks

Mass Transfer Objective Questions pdf Online Test - Set 16

Practice Test: Question Set - 16

1. In McCabe-Thiele method, at infinite reflux ratio
    (A) Number of plates is maximum
    (B) Overhead product is maximum
    (C) Both the operating lines coincide with the diagram
    (D) None of these

2. Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the
    (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments
    (B) Pressure drop in the equipment will be very high
    (C) Viscosity variation of the fluids may cause channelling/flooding
    (D) None of these

3. Pick out the correct statement.
    (A) Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas
    (B) The 'Hatta number' is important in problems involving gas absorption without chemical reaction
    (C) For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both components is linear in the case of steady state equimolal counter-diffusion
    (D) Total reflux in case of distillation operation requires infinite number of plates for a binary system separation

4. A binary mixture of benzene and cyclohexane is separated by
    (A) Flash vaporization
    (B) Extractive distillation
    (C) Solvent extraction
    (D) Ordinary distillation

5. Mass transfer co-efficient 'K' according to penetration theory varies with mass diffusivity as
    (A) D0.5
    (B) D
    (C) 1/D
    (D) D1.5

6. Free flowing granular materials can be best dried in a __________ drier.
    (A) Rotary
    (B) Cylinder
    (C) Drum
    (D) Freeze

7. In a packed bed absorption column, the channelling will be noted by the
    (A) Increase in flow rate
    (B) Sharp drop in pressure drop
    (C) Sharp rise in pressure drop
    (D) None of these

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

9. Fractional solvent extraction
    (A) Employs only one solvent
    (B) Employs two solvents
    (C) Results in low interfacial tension
    (D) None of these

10. At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.
    (A) Is greater than
    (B) Is lower than
    (C) Is same as
    (D) Cannot be predicted as data are insufficient

11. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
    (A) Wet bulb temperature
    (B) Partial pressure of water vapor
    (C) Relative humidity
    (D) None of these

12. Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.
    (A) 100
    (B) 50
    (C) 78
    (D) None of these

13. __________ is the separation technique used for desalination of sea water.
    (A) Thermal diffusion
    (B) Reverse osmosis
    (C) Adsorption
    (D) Absorption

14. The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law.
    (A) Exponential
    (B) Parabolic
    (C) Linear
    (D) Cubic

15. A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below:
Mass Transfer - Set 16, Question No. 15

In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is

    (A) 0.5
    (B) 0.6
    (C) 1.0
    (D) 2.0

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