Chemical Engineering MCQs

Page No. 662

The equilibrium liquid composition compared to the vapor composition in case of________________?


aMore

✖


bLess

✖


cSame

✓


dEither more or less; depends on the system

✖


View Answer Same

Which of the following is not a unit of mass transfer co-efficient ?


aMoles transferred/ [(time) (area) (mole fraction)]

✖


bMoles transferred/ [(time) (area) (mass A/mass B)]

✖


cMoles transferred/ [(time) (area) (pressure)]

✖


dNone of these

✓


View Answer None of these

Dry bulb temperature of the gas is _____________ the wet bulb temperature?


aLess than

✖


bMore than

✓


cEqual to

✖


dNone of these

✖


View Answer More than

The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases ‘A’ and ‘B’ is____________?


a1

✖


b∞

✓


c0.5

✖


d2

✖


View Answer ∞

Rose oil is extracted from rose leaves using ____________ distillation?


aHigh pressure

✖


bLow pressure

✖


cExtractive

✖


dSteam

✓


View Answer Steam

Back-trapping in a distillation column ?


aIncreases tray efficiency

✖


bDecreases tray efficiency

✓


cReduces pressure drop

✖


dIs desirable, as it provides improved vapour-liquid contact

✖



In the constant rate period of the rate of drying curve for batch drying,_________________?


aCracks develop on the surface of the solid

✖


bRate of drying decreases abruptly

✖


cSurface evaporation of unbound moisture occurs

✓


dNone of these

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The most economical range of absorption factor is____________________?


a0 to 0.5

✖


b0 to 3

✖


c1.25 to 2

✓


d5 to 15

✖


View Answer 1.25 to 2

In case of absorption, both the operating and equilibrium lines will be straight for______________?


aIsothermal operation

✖


bDilute solutions

✖


cDilute solutions and isothermal operation

✓


dNone of these

✖



Bollman extractor___________________?


aIs a static bed leaching equipment

✖


bIs used for extraction of oil from oilseed

✓


cIs a centrifugal extractor

✖


dEmploys only counter-current extraction

✖



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