Chemical Engineering MCQs

Page No. 689

Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture?


aFree


bUnbound


cEquilibrium


dBound


View Answer Equilibrium

For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?


aIncreases


bDecreases


cRemain same


dEither A. or B.; depends on the gas


View Answer Increases

With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?


aDecreases


bRemains unchanged


cIncreases


dDecreases exponentially


View Answer Increases

A natural draft cooling tower is filled with wooden grids, which covers about _________________ percent of the tower height?


a10-15


b30-40


c70-80


d90-100


View Answer 10-15

The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?


a√T


bT2


cT


dT4


View Answer √T

Which of the following processes is not an example of adsorption applied to gaseous separations ?


aRecovery of valuable solvent vapors from dilute mixture with air and other gases


bDehumidification of air and gas


cRemoval of objectionable odour and impurities from industrial gases


dDecolouration of yellow glycerine



The cooling effect in a cooling tower can be speeded up by _______________________?


aIncreasing the air velocity and area of exposed wet surface


bReducing the barometric pressure


cReducing the humidity of the air


dAll A., B. and C.


View Answer All A., B. and C.

To remove all the moisture from a wet solid it requires exposure to _____________ air?


aPerfectly dry


bHighly humid


cHigh temperature


dNone of these


View Answer Perfectly dry

Pore size of the molecular sieve 5A is ____________________ mm ?


a5


b0.5


c0.05


d50


View Answer 0.5

For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?


aG/(FG . a)


bFG/(G . a)


c(G . a)/FG


dL/(FG . G)


View Answer G/(FG . a)

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