Chemical Engineering MCQs

Page No. 690

Perforated plate towers are unique for solvent extraction because, they provide_____________________?


aHigher contact area


bBetter contact of the phase


cRepeated coalescence & redispersion of the drop phase


dNone of these



The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 – PA2) is for_______________________?


aFick’s second law of diffusion


bSteady state diffusion for stagnant case


cLiquid M.T.C. by Higbie penetration theory


dNone of these



For the same system, if the same liquid used in an absorber is decreased, the tower height will__________________?


aIncrease


bDecrease


cRemain unaffected


dDecrease or increase; depends on the type of liquid


View Answer Increase

The commonly used solvent in supercritical extraction is_____________________?


aMethyl ethyl ketone


bWater


cCarbon tetrachloride


dCarbon dioxide


View Answer Carbon dioxide

Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?


alog P vs. T


blog P vs. log T


cT vs. P


dP vs. log T


View Answer log P vs. T

The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?


aD/a


bD/2a


cProportional to √D


dDependent on the Reynolds number



The relative volatility of a binary mixture at constant temperature _________________ the total pressure?


aDecreases with increase in


bIncreases with increase in


cIs independent of


dNone of these



_______________ equation applies to diffusivities in liquids?


aGilliland


bHirschfelder


cWilke and Chang


dNone of these


View Answer Gilliland

When the gas to be dissolved in liquid is a/an ___________________ then normally co-current adsorber are used?


aMixture of two gases


bPure gas


cIdeal gas


dSparingly soluble gas


View Answer Pure gas

Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?


a5.6 × 10-4


b8.5 × 10-4


c5.6 × 10-3


d8.5 × 10-3


View Answer 8.5 × 10-4

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