Chemical Engineering MCQs

Page No. 635

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


aEvaporation


bBlowdown


cEntrainment


dAll A., B. & C.


View Answer All A., B. & C.

An ideal tower packing should not _______________________?


aHave low weight per unit volume


bHave large surface area per unit volume


cHave large free cross-section


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


cLess than the sum of the vapour pressure of the components


dNone of these



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


aStanton number


bPeclet number


cThermal diffusivity


dMomentum diffusivity


View Answer Stanton number

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


aMole fractions


bMole ratios


cPartial pressure


dMass fractions


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


bThe product composition as well as the fraction vaporised


cThe fraction vaporised but not the product composition


dNeither the product composition nor the fraction vaporised



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


aPhase change of the solute as it dissolves in the solvent


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


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


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


bInterfacial surface exposed between the phases


cBoth A. & B.


dNone of these


View Answer None of these

Gaseous diffusion co-efficient increases with increase in the_____________________?


aPressure


bTemperature


cBoth A. & B.


dNeither A. nor B.


View Answer Temperature

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


aTemperature is less


bTotal pressure is less


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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