chemical engineering mass transfer MCQs – Page 27

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 Review each marked answer and report any item that may be outdated or unclear.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

521. Leaching of coffee from coffee beans is done by___________________?
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A. Dilute H2SO4 (hot)

B. Lime water

C. Hexane

D. Hot water

522. The solvent used in liquid extraction should not have high latent heat of vaporisation, because ______________________?
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A. It will decompose while recovering by distillation

B. Its recovery cost by distillation may be prohibitively high

C. It cannot be recovered by distillation

D. The pressure drop and hence the pumping cost will be very high

523. In most of the vacuum crystalliser, vacuum is generally produced by means of a_____________________?
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A. Steam jet ejector with a barometric condenser

B. None of these

C. Compressed air jet

D. Suction pump

524. Hypersorption refers to a ________________ process?
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A. Fixed bed absorption

B. Fixed bed adsorption

C. Moving bed absorption

D. Moving bed adsorption

525. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are_______________?
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A. Straight

B. Parallel

C. Both A. & B.

D. Neither A. nor B.

526. A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternary system containing two pairs of partially miscible liquids ?
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A. 1

B. 0

C. 3

D. 2

527. Pick out the correct statement?
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A. None of these

B. Diffusivity increases with the size of the individual molecule

C. Diffusivity increases with increase in molecular weight

D. Diffusivity decreases with increase in temperature

528. If a two phase system is in physical equilibrium; then it means that, the_____________________?
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A. All A., B. and C.

B. al to that from vapor phase to liquid phase

C. Escaping tendency of each component from the liquid phase to the vapor phase is exactly

D. Total pressure throughout the liquid phase is equal to that throughout the vapor phase

E. Temperature of the liquid phase is equal to that of the vapor phase

529. Refractory bricks are usually dried in a ________________ dryer?
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A. Festoon

B. Conveyor

C. Tray

D. Tunnel

530. Pick out the wrong statement?
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A. Dehydration of ethyl alcohol is most economically done by molecular distillation at very high

B. Critical moisture content is not a property of the material itself

C. uum</strong>

D. Separation of components is not possible in liquid extraction, if selectivity is unity

E. A sharp increase in pressure drop gives an indication of the flooding in a distillation column

531. Ion exchange process is similar to___________________?
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A. Adsorption

B. Leaching

C. Absorption

D. Extraction

532. _____________ is the temperature at which a gas-vapor mixture becomes saturated, when cooled at constant total pressure out of contact with a liquid ?
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A. Dew point

B. Bubble point

C. Dry bulb temperature

D. Wet bulb temperature

533. The drying time between fixed moisture contents within the constant rate period is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?
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A. ?T

B. T1.5

C. T

D. T3

534. _______________ developed the film theory ?
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A. Ergun

B. Fick

C. Higbie

D. Levenspiel

535. Pick out the wrong statement ?
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A. reases for a given L/V ratio

B. l column, in case of liquid-liquid extraction

C. tom

D. Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the

E. Vander wall adsorption is also called chemisorption

F. With decrease in feed temperature, the number of plates required for binary distillation

536. McCabe-Thiele method of binary distillation does not assume that the__________________?
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A. None of these

B. Heat of mixing is negligible

C. Sensible heat changes are negligible compared with latent heat changes

D. Molar latent heats of all components are equal

537. When the liquid over a plate is of uniform concentration, then ______________________?
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A. Murphree efficiency ? point efficiency

B. Murphree efficiency = point efficiency

C. Murphree efficiency > point efficiency

D. Murphree efficiency < point efficiency

538. As the reflux ratio decreases, the_________________?
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A. None of these

B. Column diameter increases

C. Separation becomes more efficient

D. Number of plates increases

539. The following plot gives the saturated humidity (He) versus temperature (T).Line joining (H1, T1) and (H2, T2) is the constant enthalpy line. Choose the correct one from among the alternatives A, B, C and D____________________?
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A. T1-Wet bulb temp; T2-Dry bulb temp; T3-Dew point temp

B. T1-Dew point temp; T2-Wet bulb temp; T3-Dry bulb temp

C. T1-Dry bulb temp; T2-Wet bulb temp; T3-Dew point temp

D. T1-Dew point temp; T2-Dry bulb temp; T3-Wet bulb temp

540. Entrainer used in Azeotropic distillation should____________________?
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A. Have high latent heat of vaporisation

B. Form a low boiling azeotrope with one of the constituents of the mixture

C. Have high viscosity to provide high tray efficiency

D. Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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