Chemical Engineering MCQs

Page No. 666

In case of an ideal solution, the total vapor pressure varies ______________ with the composition expressed as mole fraction?


aInversely


bLinearly


cExponentially


dNone of these


View Answer Linearly

Flooding in a distillation column is detected by a sharp ___________________?


aIncrease in Murphree plate efficiency


bDecrease in pressure drop


cDecrease in liquid hold up in the column


dIncrease in pressure drop



Which of the following operations does not involve leaching ?


aDissolving gold from ores


bDissolving pharmaceutical products from bark or roots


cDissolving sugar from the cells of the beet


dRemoving nicotine from its water solution by kerosene



Diameter to height ratio for a raschig ring is_____________________?


a1


b0.5


c2


d8


View Answer 1

With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency____________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease; depends on individual design


View Answer Increases

For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?


aCalculated


bUnknown


cKnown


dNot required


View Answer Known

Mass transfer co-efficient is directly proportional to DAB 0.5, according to ________________ theory ?


aPenetration


bSurface renewal


cFilm


dNone of these


View Answer Penetration

Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty ?


aGrid tray tower


bPerforated tray tower


cWetted wall tower


dBubble cap tower


View Answer Bubble cap tower

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the solvent flow, rate is 400 moles of S/m2. hr. The equilibrium data is represented by Y = 3X2 , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is_________________________?


a25%


b50%


c70%


d90%


View Answer 50%

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?


aD


bD2


cD0.5


d1/D


View Answer D

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