Chemical Engineering MCQs

Page No. 670

The process employing desorption of the absorbed solute by a solvent is called____________________?


aElution


bOsmosis


cReverse osmosis


dSublimation


View Answer Elution

Plate efficiency_______________________?


aIs a function of the mass transfer between liquid and vapour


bIncreases due to foaming


cIncreases due to liquid entrainment


dIncreases due to weeping and dumping of liquid



Diameter of raschig rings used in packed tower in industry is normally around _____________________ inches?


a2


b8


c12


d18


View Answer 2

In rectifying section of a continuous distillation column, the____________________?


aVapour is enriched with low boilers


bVapour is enriched with high boilers


cLiquid is stripped of high boilers


dNone of these



The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives___________________?


aLow pressure drop and high hold up


bHigh pressure drop and low hold up


cLow pressure drop and low hold up


dHigh pressure drop and high hold up



In Azeotropic mixture, the equilibrium vapour composition is____________________?


aMore than liquid composition


bLess than liquid composition


cSame as liquid composition


dIndependent of pressure



Which of the following has the same dimension as mass diffusivity ?


aMomentum flux


bKinematic viscosity


cThermal diffusivity


dBoth B. and C.


View Answer Both B. and C.

Which of the following decreases during evaporative cooling process with recirculated water supply ?


aWet bulb temperature


bRelative humidity


cPartial pressure of vapour


dNone of these


View Answer None of these

At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?


a90


b91.5


c95


d99


View Answer 95

It takes 6 hours to dry a wet solid from 50% moisture content to the critical moisture content of 15%. How much longer it will take to dry the solid to 10% moisture content, under the same drying conditions? (The equilibrium moisture content of the solid is 5%) ?


a15 min


b51 min


c71 min


d94 min


View Answer 71 min

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