New Updated Chemical Engineering MCQs – Most Latest Mass Transfer MCQs

New Updated Chemical Engineering MCQs – Most Latest Mass Transfer MCQs

This post is comprising of latest ” Mass Transfer MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest chemical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding chemical engineering then read these mcqs of Design of Steel Structures.

Latest Chemical Engineering MCQs

By practicing these MCQs of Mass Transfer MCQs – Latest Competitive Chemical Engineering MCQs , an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to Mass Transfer Mcqs “. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of Chemical engineering to approach the success. Tab this page to check “Mass Transfer Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.

Latest Mass Transfer Mcqs

The most occurred mcqs of Mass Transfer in past papers. Past papers of Mass Transfer Mcqs. Past papers of Mass Transfer Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Mass Transfer Mcqs. The Important series of Mass Transfer Mcqs are given below:

Use of packed towers for distillation is generally limited to the____________________?

A. Small sizes
B. High pressure operation
C. Multi-component distillation
D. Vacuum distillation

Paper industry employs _______________ driers?

A. Cylinder
B. Spray
C. Rotary
D. Fluidised bed

Laboratory determination of the diffusivity of vapor is done by __________________ method?

A. Gilliland’s
B. Wetted wall column
C. Winkelmann’s
D. Wike’s

Reverse osmosis is also called_________________?

A. Electrodialysis
B. Dialysis
C. Diffusion
D. Ultra-filtration

Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in_________________?

A. Large number of trays
B. Large minimum liquid to gas (L/G) ratio
C. Decreased solute solubility
D. All A., B. and C.

Can the efficiency of a plate in the distillation tower be greater than 100% ?

A. Yes; if the reflux ratio is maximum
B. Normally not; but is possible if infinite number of plates are put
C. Never
D. Yes

Dorr thickener is an equipment used for___________________?

A. Clarification
B. Sedimentation
C. Classification
D. Leaching

The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?

A. D ∝ 1/P0.5
B. D ∝ P0.5
C. D ∝ 1/P
D. D ∝ 1/P1.5

With increase in temperature, the mutual solubility of two liquids___________________?

A. Increases
B. Remains unchanged
C. Decreases
D. Decreases exponentially

A 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___________________?

A. 1.04
B. 0.54
C. 1.24
D. 1.94

The operating cost of a distillation column at minimum reflux ratio is____________________?

A. Minimum
B. Infinite
C. Maximum
D. Zero

___________________ extractor uses centrifugal force for separating the two phases?

A. Scheibel
B. Treybal
C. Podbielniak
D. None of these

Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?

A. Film
B. Surface-renewal
C. Penetration
D. None of these

In liquid extraction, if the selectivity is unity, then___________________?

A. Amount of solvent required will be minimum
B. No separation will occur
C. Separation of the constituents is the most effective
D. Solvent flow rate should be very low

Fuels And Combustion Mcqs

With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent______________________?

A. Remain same
B. Decreases
C. Increases
D. Either A. or B., depends on the system

Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?

A. Velocity
B. Humidity
C. Temperature
D. All A., B. & C.

The temperature of water cooled in cooling tower is always _________________ temperature of entering air?

A. More than the wet bulb
B. Equal to the wet bulb
C. Less than the wet bulb
D. Equal to the dry bulb

The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?

A. Kc = Kp/RT = Km . RT/P
B. Kc = Kp = Km
C. Kc = Kp . RT = Km . RT/p
D. None of these

Dimension of mass diffusivity is the same as that of_____________________?

A. Kinematic viscosity
B. Surface tension
C. Dynamic viscosity
D. Pressure

For a single component absorber, the operating line is straight only when plotted in term of ______________ units?

A. Mole fraction
B. Mole ratio
C. Partial pressure
D. None of these

The cooling effect in a cooling tower cannot be increased by_____________________?

A. Reducing the humidity of entering air
B. Increasing the air velocity over the wet surfaces
C. Lowering the barometric pressure
D. None of these

Sodium bicarbonate is produced during soda ash manufacture using a _______________ tower?

A. Packed
B. Baffle
C. Plate
D. None of these

Leaching rate is independent of the________________?

A. Temperature
B. Agitation
C. Particle size
D. None of these

With increase in temperature, the rate of leaching increases, because the___________________?

A. Diffusivity of solute increases
B. Thermal conductivity of solute increases
C. Viscosity of solvent decreases
D. None of these

Bound moisture is that liquid which exerts an equilibrium vapor pressure ________________ that of the pure liquid at the given temperature ?

A. Less than
B. Equal to
C. More than
D. Either A. or B.; depends on the solid

The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is____________________?

A. 2
B. 50
C. 0.5
D. 150

Which of the following is not a batch drier ?

A. Agitated pan drier
B. Truck drier
C. Fluidised bed drier
D. Vacuum shelf drier

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by____________________?

A. Solvent extraction
B. Evaporation
C. Continuous distillation
D. Absorption

The main reason for dividing a tall packed tower into series of small towers is to________________________?

A. Avoid flooding
B. Minimise the overall pressure drop
C. Reduce liquid hold up
D. Avoid channelling

The most efficient cooling tower out of the following is_____________________?

A. Induced draft
B. Natural draft
C. Forced draft
D. Atmospheric

Molecular distillation is_____________________?

A. High temperature distillation
B. Very low pressure distillation
C. For heat-sensitive materials
D. Both B. and C.

The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is____________________?

A. 1
B. 0.5
C. ∞
D. 2

Mechanical Operations Mcqs

All moisture in a non-hygroscopic material is the ________________ moisture?

A. Equilibrium
B. Free
C. Unbound
D. Bound

At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is ________________ percent.?

A. 50
B. 0
C. 100
D. Between 0 and 100

Molecular diffusivity of a liquid__________________?

A. Increases with temperature
B. Is independent of temperature
C. May increase or decrease with temperature
D. Decreases with temperature

Use of natural draft cooling tower is practised, when the air has low ?

A. Temperature
B. Humidity
C. Both A. & B.
D. Neither A. nor B.

Raschig ring made of porcelain cannot be used for treating concentrated___________________?

A. Nitric acid
B. Hydrochloric acid
C. Alkalis
D. Sulphuric acid

Tower diameter may be decreased by__________________?

A. Increasing the liquid flow rate
B. Use of increased tray spacing
C. Using higher reflux ratio
D. Increasing the vapour flow rate

The humid volume may be increased by increasing the____________________?

A. Humidity at constant temperature
B. Temperature at constant humidity
C. Both A. and B.
D. Neither A. nor B.

Pick out the correct relationship. (Where, Ri = internal reflux ratio Ro = external reflux ratio.) ?

A. (1 + Ro) = Ro/Ri
B. (1 + Ri) = Ro/Ri
C. (1 – Ro) = Ro/Ri
D. (1 – Ri) = Ro/Ri

Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the_________________?

A. Difficulty in its fabrication
B. High pressure drop of the gas
C. High evaporation losses of water
D. None of these

According to Poiseuille’s law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)___________________?

A. √μ
B. 1/μ
C. μ
D. μ2

In case of constant underflow extraction operation, the _______________________ at all solute concentration?

A. Ratio of the insoluble to solution is constant
B. Solids are drained to the same extent
C. Both A. & B.
D. Neither A. nor B.

Packed column distillation is limited to the column _____________ metres?

A. Diameter < 0.6
B. Height < 6
C. Both A. & B.
D. Neither A. nor B.

During constant rate period, the rate of drying decreases with the______________________?

A. Increase in air humidity
B. Decrease in air temperature
C. Both A. and B.
D. Neither A. nor B.

Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele’s method ?

A. Partial condenser
B. Reboiler
C. Total condenser
D. Both B. and C

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. Material cannot be distilled by indirect heating even under low pressure, because of the high boiling temperature
C. Liquids decompose, if distilled directly at atmospheric pressure
D. Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature

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. 51 min
B. 15 min
C. 71 min
D. 94 min

At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?

A. 91.5
B. 90
C. 95
D. 99

Which of the following decreases during evaporative cooling process with recirculated water supply ?

A. Relative humidity
B. Wet bulb temperature
C. Partial pressure of vapour
D. None of these

Which of the following has the same dimension as mass diffusivity ?

A. Momentum flux
B. Thermal diffusivity
C. Kinematic viscosity
D. Both B. and C.

Mass Transfer Mcqs

In Azeotropic mixture, the equilibrium vapour composition is____________________?

A. Less than liquid composition
B. More than liquid composition
C. Same as liquid composition
D. Independent of pressure

The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?

A. High pressure drop and low hold up
B. Low pressure drop and high hold up
C. Low pressure drop and low hold up
D. High pressure drop and high hold up

In rectifying section of a continuous distillation column, the____________________?

A. Liquid is stripped of high boilers
B. Vapour is enriched with high boilers
C. Vapour is enriched with low boilers
D. None of these

Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?

A. 2
B. 12
C. 8
D. 18

Plate efficiency_______________________?

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

The process employing desorption of the absorbed solute by a solvent is called____________________?

A. Elution
B. Sublimation
C. Reverse osmosis
D. Osmosis

The ratio of Murphree plate efficiency to point efficiency is 1 in a ______________________ flow model?

A. Plug
B. Perfectly mixed
C. Both of the above
D. Neither of the above

Weeping in a distillation column_____________________?

A. Results due to very high gas velocity
B. Provides large interfacial surface for mass transfer
C. Increases tray efficiency
D. Results due to very low gas velocity

In McCabe-Thiele method, at infinite reflux ratio___________________?

A. Overhead product is maximum
B. Number of plates is maximum
C. Both the operating lines coincide with the diagram
D. None of these

The expression, y(1 – x)/x(1 – y) is for_____________________?

A. Selectivity
B. Relative volatility
C. Absorption factor
D. Murphree efficiency

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. Viscosity variation of the fluids may cause channeling/flooding
C. Pressure drop in the equipment will be very high
D. None of these

A binary mixture of benzene and cyclohexane is separated by___________________?

A. Solvent extraction
B. Extractive distillation
C. Flash vaporisation
D. Ordinary distillation

Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________?

A. D0.5
B. 1/D
C. D
D. D1.5

In a packed bed absorption column, the channelling will be noted by the ____________________?

A. Sharp rise in pressure drop
B. Sharp drop in pressure drop
C. Increase in flow rate
D. None of these

The ratio of Murphree plate efficiency to point efficiency is always > 1 in a _______________ flow model?

A. Plug
B. Perfectly mixed
C. Both of the above
D. Neither of the above

Fractional solvent extraction______________________?

A. Results in low interfacial tension
B. Employs two solvents
C. Employs only one solvent
D. None of these

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. Relative humidity
C. Partial pressure of water vapor
D. None of these

Free flowing granular materials can be best dried in a __________________ drier?

A. Rotary
B. Drum
C. Cylinder
D. Freeze

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 same as
C. Is lower than
D. Cannot be predicted as data are insufficient

New Updated Chemical Engineering MCQs – Most Latest Mass Transfer MCQs

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