chemical engineering mass transfer MCQs – Page 31

Practise multiple-choice questions from chemical engineering mass transfer for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering mass transfer Mcqs

601. The most common packing used in industrial operations is _______________ rings?
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A. Raschig

B. Cross-partition

C. Single spiral

D. Lessing

602. Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1F is called the________________?
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A. Sensible heat

B. Specific heat

C. Humid heat

D. Latent heat

603. An example of elution is______________________?
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A. Dissolution of tannin out of tree barks by water

B. Separation of sugar from sugar beet by hot water

C. Recovery of vegetable oils from seeds

D. Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank

604. For _______________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same?
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A. Unsaturated surface

B. Constant rate

C. Both A. and B.

D. Neither A. nor B.

605. In the desorption of highly soluble gas from the liquid, the main resistance will be in the ______________ phase?
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A. Gas

B. Liquid

C. Both A. & B.

D. Neither A. nor B.

606. Physical absorption is__________________?
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A. An irreversible phenomenon

B. A reversible phenomenon

C. Accompanied by evolution of heat

D. Both B. and C.

607. Dry bulb temperature of unsaturated air is more than its ________________ temperature?
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A. Dew point

B. Wet bulb

C. Both A & B

D. Neither A nor B

608. If moisture content of solid on dry basis is X, then the same on wet basis is____________________?
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A. (1 X)/X

B. (1 + X)/X

C. X/(X + 1)

D. X/(1 X)

609. Which of the following equipments is not used for gas dispersion ?
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A. Agitated vessels

B. Bubble cap tray towers

C. Perforated sieve tray towers

D. Spray towers

610. Pick out the wrong statement ?
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A. tillation column</strong>

B. Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele

C. Heat removal load on cooler remains constant, even with increase of the reflux ratio in a

D. hod of theoretical plate calculation for distillation column

E. Even a forced draft cooling tower cannot cool water below the wet bulb temperature

F. Different solids have different equilibrium moisture curves

611. Pick out the correct statement ?
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A. ction

B. tem separation

C. Higher hold up of the solid in the rotary dryer results in better exposure of the solids to the gas

D. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both

E. Total reflux in case of distillation operation requires infinite number of plates for a binary

F. ponents is linear in the case of steady state equimolal counter-diffusion</strong>

612. In case of absorption with exothermic reaction, for fluids having ___________________?
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A. Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change

B. the degree of turbulence

C. Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same

D. Both A. and B.

E. Pr = Sc; there wont be any change in heat and mass transfer flux with changes in degree of

F. bulence

613. Positive deviation from Raoults law means a mixture whose total pressure is___________________?
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A. None of these

B. Less than the sum of the vapour pressure of the components

C. Greater than that computed for ideality

D. Less than that computed for ideality

614. Pick out the wrong statement?
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A. ponents</strong>

B. The solubility of a particular gas in ideal solution in any solvent is always the same

C. The operating line always lies above the equilibrium solubility curve in case of a single

D. ponent stripper

E. The operating line always lies below the equilibrium solubility curve in case of a single

F. The operating pressure in solvent extraction system should be below vapor pressures of all

615. Inside the distillation column, the________________________?
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A. None of these

B. Driving force for the vapour flow is the pressure drop

C. Pressure increases gradually from bottom to the top of the column

D. Liquids are not always at their bubble points

616. During drying operation, it is easier to remove the ________________ moisture ?
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A. Bound

B. Critical

C. Unbound

D. Equilibrium

617. A good solvent used for absorption should not have very high____________________?
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A. Vapor pressure

B. All A., B. & C.

C. Freezing point

D. Viscosity

618. With increase in pressure, the relative volatility for a binary system__________________?
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A. Decreases

B. Remains same

C. Increases

D. Either A. or B., depends on the system

619. Deaeration (removal of O2) of water is done by_________________?
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A. Ion-exchange

B. Absorption

C. Rectification

D. Adsorption

620. Sticky material can be dried in a ________________ dryer ?
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A. Tray

B. Rotary

C. Fluidised bed

D. None of these

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