Chemical Engineering MCQs

Page No. 672

Raschig ring made of porcelain cannot be used for treating concentrated___________________?


aHydrochloric acid


bNitric acid


cAlkalis


dSulphuric acid


View Answer Alkalis

Use of natural draft cooling tower is practised, when the air has low ?


aHumidity


bTemperature


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Molecular diffusivity of a liquid__________________?


aIncreases with temperature


bDecreases with temperature


cMay increase or decrease with temperature


dIs independent of temperature



At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is ________________ percent.?


a100


b0


c50


dBetween 0 and 100


View Answer 0

All moisture in a non-hygroscopic material is the ________________ moisture?


aFree


bEquilibrium


cUnbound


dBound


View Answer Unbound

The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is____________________?


a1


b


c0.5


d2


View Answer 1

Molecular distillation is_____________________?


aHigh temperature distillation


bFor heat-sensitive materials


cVery low pressure distillation


dBoth B. and C.


View Answer Both B. and C.

The most efficient cooling tower out of the following is_____________________?


aInduced draft


bForced draft


cNatural draft


dAtmospheric


View Answer Induced draft

The main reason for dividing a tall packed tower into series of small towers is to________________________?


aMinimise the overall pressure drop


bAvoid flooding


cReduce liquid hold up


dAvoid channelling


View Answer Avoid channelling

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by____________________?


aSolvent extraction


bContinuous distillation


cEvaporation


dAbsorption


View Answer Solvent extraction

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