Chemical Engineering MCQs

Page No. 633

Which of the following quantities need not be fixed before starting the design of a cocurrent absorber ?


aHeat gain or loss


bFlow rate of entering liquid


cFlow rate of gas


dNone of these



During drying operation, it is easier to remove the ________________ moisture ?


aEquilibrium


bCritical


cUnbound


dBound


View Answer Unbound

In extractive distillation, solvent is_____________________?


aAdded to alter the relative volatility of the mixture


bOf high volatility


cPresent in overhead stream


dOf high viscosity to give high tray efficiency



At a fixed total pressure, humidity depends only on the _______________________?


aPartial pressure of vapour in the mixture


bHeat capacity of the vapour


cDensity of the vapour


dNone of these



The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?


a1


b0.5


c10


d0


View Answer 1

The diffusivity D. in a binary gas mixture is related to the temperature (T) as________________________?


aD ∝ T


bD ∝ T0.5


cD ∝ T1.5


dD ∝ T2


View Answer D ∝ T1.5

The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its_____________________?


aIntegral heat of adsorption


bHeat of wetting


cDifferential heat of adsorption


dHeat of normal condensation



An Azeotropic mixture is a ________________ mixture?


aBinary


bTernary


cConstant boiling point


dNone of these



Inside the distillation columns, the ________________________?


aHighest temperatures is near the feed plate


bDriving force for the liquid flow is its weight


cVapors are not always at their dew points


dAll A., B. and C.



Total reflux in a distillation operation requires minimum____________________?


aReboiler load


bNumber of plates


cCondenser load


dAll A., B. and C.


View Answer Number of plates

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