Chemical Engineering MCQs

Page No. 674

The temperature of water cooled in cooling tower is always _________________ temperature of entering air?


aMore than the wet bulb


bLess than the wet bulb


cEqual to the wet bulb


dEqual to the dry bulb



Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?


aHumidity


bVelocity


cTemperature


dAll A., B. & C.


View Answer All A., B. & C.

With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent______________________?


aIncreases


bDecreases


cRemain same


dEither A. or B., depends on the system


View Answer Decreases

In liquid extraction, if the selectivity is unity, then___________________?


aSeparation of the constituents is the most effective


bNo separation will occur


cAmount of solvent required will be minimum


dSolvent flow rate should be very low



Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?


aFilm


bPenetration


cSurface-renewal


dNone of these


View Answer Film

___________________ extractor uses centrifugal force for separating the two phases?


aTreybal


bScheibel


cPodbielniak


dNone of these


View Answer Podbielniak

The operating cost of a distillation column at minimum reflux ratio is____________________?


aMinimum


bMaximum


cInfinite


dZero


View Answer Minimum

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?


a0.54


b1.04


c1.24


d1.94


View Answer 1.24

The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?


aD ∝ P0.5


bD ∝ 1/P0.5


cD ∝ 1/P


dD ∝ 1/P1.5


View Answer D ∝ 1/P

Dorr thickener is an equipment used for___________________?


aClassification


bSedimentation


cClarification


dLeaching


View Answer Sedimentation

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