Chemical Engineering MCQs

Page No. 644

For continuous drying of granular or crystalline material, the dryer used is the _______________ dryer?


aTunnel


bTray


cRotary


dNone of these


View Answer Rotary

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________


a0


b1


c2


d3


View Answer 1

_____________ is used as an ‘entrainer’ for the separation of acetic acid-water mixture by distillation?


aFurfural


bBenzol


cButyl acetate


dHexane


View Answer Butyl acetate

Steady state equimolal counter diffusion occurs in case of ____________________?


aLeaching


bAbsorption


cBinary phase distillation


dLiquid-liquid extraction



In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________________ reflux ?


aTotal


bMinimum


cOperating


dMaximum permissible


View Answer Total

Equilibrium-moisture curves of different solids ____________________ ?


aAre different


bAre same


cDepend on the humidity of the gas


dNone of these


View Answer Are different

The vapour pressure exerted by the moisture contained in a wet solid depends upon the____________________?


aNature of the moisture


bTemperature


cNature of the solid


dAll A., B. and C.


View Answer All A., B. and C.

For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as___________________?


aRe0.33


bRe0.53


cRe0.83


dRe


View Answer Re0.83

With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas________________?


aIncreases


bDecreases


cDecreases linearly


dRemain unaffected


View Answer Decreases

At what value of reflux ratio, number of theoretical plates in a distillation column is minimum ?


a0


b1


c


d< 1


View Answer

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