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



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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