Chemical Engineering MCQs

Page No. 635

Make up water is supplied during cooling tower operation to compensate for water losses due to______________________?


aEvaporation

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bBlowdown

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cEntrainment

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dAll A., B. & C.

✓


View Answer All A., B. & C.

An ideal tower packing should not _______________________?


aHave low weight per unit volume

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bHave large surface area per unit volume

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cHave large free cross-section

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dHold up large amount of liquid in the packing

✓



Positive deviation from Raoult’s law means a mixture whose total pressure is___________________?


aGreater than that computed for ideality

✓


bLess than that computed for ideality

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cLess than the sum of the vapour pressure of the components

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dNone of these

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(NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?


aStanton number

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bPeclet number

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cThermal diffusivity

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dMomentum diffusivity

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View Answer Stanton number

The operating line for an absorber is curved, when plotted in terms of _______________________?


aMole fractions

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bMole ratios

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cPartial pressure

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dMass fractions

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View Answer Partial pressure

One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult’s law is obeyed, then changing the feed composition would effect ?


aThe product composition but not the fraction vaporised

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bThe product composition as well as the fraction vaporised

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cThe fraction vaporised but not the product composition

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dNeither the product composition nor the fraction vaporised

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The rate of solid-liquid extraction is limited by the_________________?


aPhase change of the solute as it dissolves in the solvent

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bDiffusion of the solute through the solvent in the pores to the outside of the particle

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cDiffusion of the solute from the solution in contact with the particle to the main bulk of the solution

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dAll A , B. & C.

✓


View Answer All A , B. & C.

The rate of mass transfer is not dependent upon the______________________?


aDegree of dispersion of one fluid in the other

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bInterfacial surface exposed between the phases

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cBoth A. & B.

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dNone of these

✓


View Answer None of these

Gaseous diffusion co-efficient increases with increase in the_____________________?


aPressure

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bTemperature

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Temperature

In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because_______________?


aTemperature is less

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bTotal pressure is less

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cMixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition

✓


dSaturated steam is used for steam distillation

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