Hello students welcome to msbte news in this article we have provided 22609 Mass Transfer Mcq Questions and Answer. This Mass Transfer Multiple Choice Questions is ideal for Students who are in Third Year of Diploma in Chemical Engineering courses. By referring Below Given Mass Transfer Objective Questions Pdf for Diploma you will get to know about the paper pattern of Msbte Mcq Winter 2021 exams.
with this Mass Transfer Mcq Questions 3rd year students can practice for their upcoming Winter 2021 exams. In this Mass Transfer mcq pdf we have selected 30 important questions from previous year papers. you can also download Mass Transfer Pdf below we have given a download link.
Table of Contents
Mass Transfer Mcq Questions and Answer
1. During the constant rate period of drying of a solid,
(A) Increased air humidity decreases the rate of drying
(B) Increasing the air temperature decreases the drying rate
(C) Surface evaporation of unbound moisture occurs
(D) None of these
Correct!
Wrong!
2. Large scale drying of wheat is done in a __________ dryer.
(A) Fluidised bed
(B) Spouted bed
(C) Tray
(D) Vacuum rotary
Correct!
Wrong!
3. Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is
(A) Insoluble in the liquid
(B) Soluble in the liquid
(C) Non-ideal in nature
(D) At a fixed temperature
Correct!
Wrong!
4. With increase in temperature, the leaching rate increases due to
(A) Decreased liquid viscosity
(B) Increased diffusivity
(C) Both (A) and (B)
(D) Neither (A) nor (B)
Correct!
Wrong!
5. As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Can either increase or decrease, depends on the system
Correct!
Wrong!
6. In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
(A) q > 1
(B) q < 1
(C) q = 1
(D) q = 0
Correct!
Wrong!
7. Large scale drying of sugar is done in a __________ dryer.
(A) Spouted bed
(B) Tray
(C) Rotary
(D) Truck
Correct!
Wrong!
8. Though, theoretically the adsorption & desorption isotherms are expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that is obtained for adsorption.
(A) Lower than
(B) Higher than
(C) Same as
(D) Either same or higher than
Correct!
Wrong!
9. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is
(A) 2.0
(B) 1.56
(C) 1.0
(D) 0.56
Correct!
Wrong!
10. Reboiler is considered as one theoretical plate, because
(A) Of the assumption that vapor and liquid leaving the reboiler are in equilibrium
(B) Vapor is recycled to the column
(C) Reboiler itself contains one plate
(D) None of these
Correct!
Wrong!
11. In an absorption column, the flooding velocity for random packing is __________ that for stacked/regular packing.
(A) Greater than
(B) Smaller than
(C) Equal to
(D) Either (A), or (B); depends on the type of packing
Correct!
Wrong!
12. Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer coefficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is:
(A) 5.6 × 10-4
(B) 8.5 × 10-4
(C) 5.6 × 10-3
(D) 8.5 × 10-3
Correct!
Wrong!
13. In the case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the __________ number.
(A) Lewis
(B) Grashoff
(C) Sherwood
(D) None of these
Correct!
Wrong!
14. When the gas to be dissolved in liquid is a/an __________ then normally co-current adsorber are used.
(A) Mixture of two gases
(B) Pure gas
(C) Ideal gas
(D) Sparingly soluble gas
Correct!
Wrong!
15. Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through a water spray chamber maintained at 35°C. The air will be
(A) Cooled
(B) Humidified
(C) Both (A) & (B)
(D) Dehumidified
Correct!
Wrong!
16. __________ equation applies to diffusivities in liquids.
(A) Gilliland
(B) Hirschfelder
(C) Wilke and Chang
(D) None of these
Correct!
Wrong!
17. Mass transfer coefficient is defined as
(A) Flux = Coefficient/concentration difference
(B) Coefficient = Flux/concentration difference
(C) Flux=concentration difference/coefficient
(D) None of these
Correct!
Wrong!
- The relative volatility of a binary mixture at constant temperature __________ the total pressure.Â
(A) Decreases with increase in
(B) Increases with increase in
(C) Is independent of
(D) None of these
Correct!
Wrong!
19. Large quantity of silica gel is normally dried in a __________ dryer.
(A) Freeze
(B) Through circulation
(C) Rotary vacuum
(D) Tray
Correct!
Wrong!
 20. The mass transfer coefficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which ‘D’ is the diffusivity of solute, is
(A) D/a
(B) D/2a
(C) Proportional to √D
(D) Dependent on the Reynolds number
Correct!
Wrong!
21. The value of ‘L/mG’ ratio for economical absorption operation ranges from
(A) 0.5 to 0.8
(B) 0.8 to 1.2
(C) 1.25 to 2.0
(D) 2.5 to 3.5
Correct!
Wrong!
22. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature).
(A) log P vs. T
(B) log P vs. log T
(C) T vs. P
(D) P vs. log T
Correct!
Wrong!
23. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
(A) 6.89
(B) 8.89
(C) 10
(D) 8.25
Correct!
Wrong!
24. The commonly used solvent in supercritical extraction is
(A) Methyl ethyl ketone
(B) Water
(C) Carbon tetrachloride
(D) Carbon dioxide
Correct!
Wrong!
25. Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.
(A) Rotary
(B) Tray
(C) Freeze
(D) None of these
Correct!
Wrong!
- For the same system, if the same liquid used in an absorber is decreased, the tower height willÂ
(A) Increase
(B) Decrease
(C) Remain unaffected
(D) Decrease or increase; depends on the type of liquid
Correct!
Wrong!
27. In steam distillation, the
(A) Temperature is 100°C
(B) Temperature is more than 100° C
(C) Product must be immiscible with water
(D) Temperature is higher than the boiling point of either component
Correct!
Wrong!
28. The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 – PA2) is for
(A) Fick’s second law of diffusion
(B) Steady state diffusion for stagnant case
(C) Liquid M.T.C. by Higbie penetration theory
(D) None of these
Correct!
Wrong!
29. A slurry is to be dried to produce flaky solid. Which dryer would you recommend?
(A) Spray dryer
(B) Drum dryer
(C) Rotary dryer
(D) Dielectric dryer
Correct!
Wrong!
30. Perforated plate towers are unique for solvent extraction because, they provide
(A) Higher contact area
(B) Better contact of the phase
(C) Repeated coalescence & redispersion of the drop phase
(D) None of these
Correct!
Wrong!
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22609 Mass Transfer
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Mass Transfer Multiple Choice Questions Pdf
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