The Following Section consists of Multiple Choice Questions on Mass Transfer.
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Mass Transfer MCQ
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Question 1 of 20
1. Question
1 pointsMass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
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Question 2 of 20
2. Question
1 pointsIn a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
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Question 3 of 20
3. Question
1 pointsFenske equation determines the
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Question 4 of 20
4. Question
1 pointsThe term “cooling range” in a cooling tower refers to the difference in the temperature of
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Question 5 of 20
5. Question
1 pointsWhich of the following is the most suitable for extraction in a system having very low density difference ?
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Question 6 of 20
6. Question
1 pointsTotal reflux in a distillation operation requires minimum
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Question 7 of 20
7. Question
1 pointsThe difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is
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Question 8 of 20
8. Question
1 pointsFenske’s equation for determining the minimum number of theoretical stages in distillation column holds good, when the
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Question 9 of 20
9. Question
1 pointsWhen the temperature and humidity of air is low, we usually use __________ draft cooling tower.
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Question 10 of 20
10. Question
1 points__________ columns are used for liquid dispersion in a continuous gas phase.
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Question 11 of 20
11. Question
1 pointsOverall efficiency of the distillation column is
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Question 12 of 20
12. Question
1 pointsDrying operation under vacuum is carried out to
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Question 13 of 20
13. Question
1 pointsAir initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a
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Question 14 of 20
14. Question
1 pointsSeparation of two or more components of a liquid solution can not be achieved by
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Question 15 of 20
15. Question
1 pointsAt minimum reflux ratio for a given separation
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Question 16 of 20
16. Question
1 pointsRelative humidity is the ratio of the
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Question 17 of 20
17. Question
1 pointsIn batch distillation with constant reflux, overhead product composition __________ with time.
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Question 18 of 20
18. Question
1 pointsPsychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.
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Question 19 of 20
19. Question
1 pointsHeat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the
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Question 20 of 20
20. Question
1 pointsTo increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)
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Mass Transfer MCQ 2
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Question 1 of 20
1. Question
1 pointsDesulphurisation of petrol is done in a
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Question 2 of 20
2. Question
1 pointsChemisorption compared to physical absorption has
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Question 3 of 20
3. Question
1 pointsRate of adsorption increases as the
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Question 4 of 20
4. Question
1 pointsPick out the system with maximum boiling azeotrope at 1 atm.
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Question 5 of 20
5. Question
1 pointsAt 750°K and 1 atm, the approximate value of Schmidt number for air is
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Question 6 of 20
6. Question
1 pointsCalculation of mass transfer co-efficient is mostly/normally done using __________ theory.
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Question 7 of 20
7. Question
1 pointsWhich of the following is used for the concentration of rubber latex ?
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Question 8 of 20
8. Question
1 pointsAs the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
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Question 9 of 20
9. Question
1 pointsIn triangular co-ordinates, the ternery composition point falls __________ of the triangle.
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Question 10 of 20
10. Question
1 pointsReboiler is considered as one theoretical plate, because
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Question 11 of 20
11. Question
1 pointsIn a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
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Question 12 of 20
12. Question
1 pointsReverse osmosis is also called
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Question 13 of 20
13. Question
1 pointsWhich of the following is not a batch drier?
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Question 14 of 20
14. Question
1 pointsSteam distillation is not recommended to be used, if the
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Question 15 of 20
15. Question
1 pointsRayleigh equation applies to __________ distillation.
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Question 16 of 20
16. Question
1 pointsMost important factor to be considered in the selection of packings for absorbers is the __________ of packing.
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Question 17 of 20
17. Question
1 points__________ is the separation technique used for desalination of sea water.
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Question 18 of 20
18. Question
1 pointsDanckwerts developed the __________ theory.
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Question 19 of 20
19. Question
1 pointsWhich of the following provides maximum contact surface for a liquid-vapour system?
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Question 20 of 20
20. Question
1 pointsFor experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
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Mass Transfer MCQ 3
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Question 1 of 20
1. Question
1 pointsIn stripping section of continuous distillation column, the
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Question 2 of 20
2. Question
1 pointsMolality is defined as the number of gm moles of solute per __________ of solvent.
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Question 3 of 20
3. Question
1 points_________ is concerned with the adsorption equilibria.
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Question 4 of 20
4. Question
1 pointsFractional solvent extraction
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Question 5 of 20
5. Question
1 pointsIn the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
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Question 6 of 20
6. Question
1 pointsRaschig ring made of procelain cannot be used for treating concentrated
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Question 7 of 20
7. Question
1 pointsDuring constant rate drying period, vaporisation rate per unit drying surface area
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Question 8 of 20
8. Question
1 pointsPick out the wrong statement.
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Question 9 of 20
9. Question
1 pointsIn rectifying section of a continuous distillation column, the
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Question 10 of 20
10. Question
1 pointsFor a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
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Question 11 of 20
11. Question
1 pointsA 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
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Question 12 of 20
12. Question
1 pointsMinimum reflux ratio in a distillation column results in
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Question 13 of 20
13. Question
1 pointsFlooding in a distillation column is detected by a sharp
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Question 14 of 20
14. Question
1 pointsIn extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)
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Question 15 of 20
15. Question
1 pointsIn case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
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Question 16 of 20
16. Question
1 pointsAt constant pressure, with increase of temperature, the dew point will
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Question 17 of 20
17. Question
1 pointsFor a single component absorber, the operating line is straight only when plotted in term of __________ units.
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Question 18 of 20
18. Question
1 pointsFor a binary mixture with low relative volatility,
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Question 19 of 20
19. Question
1 pointsPlate efficiency
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Question 20 of 20
20. Question
1 pointsAbsorption accompanied by heat evolution results in
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Mass Transfer MCQ 4
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Question 1 of 20
1. Question
1 pointsEven though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
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Question 2 of 20
2. Question
1 pointsFor a distillation column operating at minimum reflux, the
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Question 3 of 20
3. Question
1 pointsFlash distillation is suitable for the separation of components
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Question 4 of 20
4. Question
1 pointsIn Mcabe-Thiele method, at infinite reflux ratio
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Question 5 of 20
5. Question
1 pointsLeaching rate is independent of the
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Question 6 of 20
6. Question
1 pointsUse of packed towers for distillation is generally limited to the
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Question 7 of 20
7. Question
1 pointsPick out the wrong statement.
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Question 8 of 20
8. Question
1 pointsWhich of the following decreases during evaporative cooling process with recirculated water supply ?
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Question 9 of 20
9. Question
1 pointsLaboratory determination of the dif-fusivity of vapor is done by __________ method.
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Question 10 of 20
10. Question
1 pointsThe minimum liquid rate to be used in an absorber corresponds to an operating line
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Question 11 of 20
11. Question
1 pointsSchimdt number and Lewis number for pure air at atmospheric conditions are respectively
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Question 12 of 20
12. Question
1 pointsMolecular diffusion is caused by the
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Question 13 of 20
13. Question
1 pointsAt __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
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Question 14 of 20
14. Question
1 pointsSeparation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their
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Question 15 of 20
15. Question
1 pointsComponents, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
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Question 16 of 20
16. Question
1 pointsWhich of the following equipments is not used in liquid-liquid extraction ?
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Question 17 of 20
17. Question
1 pointsPick out the wrong statement.
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Question 18 of 20
18. Question
1 pointsEquilibrium-moisture curves of different solids
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Question 19 of 20
19. Question
1 pointsAzeotropism for ethyl alcohol-water system disappears by
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Question 20 of 20
20. Question
1 pointsDegree of freedom for leaching and solvent extraction process is
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