Chemical Engineering MCQs

Page No. 630

Drying operation under vacuum is carried out to __________________?


aDry those materials which have very high unbound moisture content


bReduce drying temperature


cIncrease drying temperature


dDry materials having high bound moisture content



In case of absorption with exothermic reaction, for fluids having ___________________?


aPr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence


bPr = Sc = 1; total mass, momentum and thermal diffusivity will be the same


cBoth A. and B.


dPr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of turbulence


View Answer Both A. and B.

At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?


a0.0


b0.2


c0.4


d1.0


View Answer 0.4

In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?


aIncreases


bDecreases


cRemains unchanged


dDepends on the pressure of the system


View Answer Decreases

In saturated gas, the__________________?


aVapour is in equilibrium with the liquid at the gas temperature


bVapour is in equilibrium with the liquid at the room temperature


cPartial pressure of vapour equals the vapour pressure of the liquid at room temperature


dNone of these



Which of the following remains constant during sensible cooling process ?


aSpecific humidity


bPartial pressure of vapour


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

For contacting a highly soluble gas with a liquid ____________________?


aBubble the gas through liquid


bSpray the liquid on gas stream


cEither A. or B. would suffice


dNone of these



The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?


aParallel


bStraight


cBoth parallel and straight


dNeither parallel nor straight



Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?


aViscosity with concentration


bDegree of ideality of the solution


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

The binary diffusivity in gases does not depend upon the ___________________?


aPressure


bTemperature


cNature of the components


dNone of these


View Answer None of these

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