Chemical Engineering MCQs

Page No. 653

Selectivity of the solvent used in solvent extraction should be)_________________?


a1


b> 1


c< 1


d0


View Answer > 1

Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off _______________ °C?


aAt < 100


bAt > 210.6


cBetween 100 and 210


dNone of these


View Answer At < 100

Molecular sieves are porous____________________?


aAlumina


bSilica


cSynthetic zeolites crystals/metal alumino-silicates


dNone of these



In liquid-liquid extraction, the number of phases at plait point is __________________?


a1


b2


c3


d4


View Answer 1

JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by___________________?


aNsh = 2


bNst = 2


cNsc = 2


dNone of these


View Answer Nsh = 2

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


aStraight


bParallel


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid) ?


ap = P


bp >>P


cp < P


dp << P


View Answer p = P

Wetted wall tower experiment determines the__________________?


aMolal diffusivity


bVolumetric co-efficient


cMass transfer co-efficient


dNone of these



Can a cooling tower cool water below the wet bulb temperature of inlet air ?


aYes


bNo


cYes; but height of cooling tower will be prohibitively high


dYes; but the air flow rate should be excessively high


View Answer No

The rough value of diffusion co-efficient of water vapor into air at 25°C may be about ______________ cm2/sec?


a0.25


b2.5


c1.25


d0.0025


View Answer 0.25

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