Chemical Engineering MCQs

Page No. 690

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


aHigher contact area

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bBetter contact of the phase

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cRepeated coalescence & redispersion of the drop phase

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dNone of these

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


aFick’s second law of diffusion

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bSteady state diffusion for stagnant case

✓


cLiquid M.T.C. by Higbie penetration theory

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dNone of these

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


aIncrease

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bDecrease

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cRemain unaffected

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dDecrease or increase; depends on the type of liquid

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View Answer Increase

The commonly used solvent in supercritical extraction is_____________________?


aMethyl ethyl ketone

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bWater

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cCarbon tetrachloride

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dCarbon dioxide

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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

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blog P vs. log T

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cT vs. P

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dP vs. log T

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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

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bD/2a

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cProportional to √D

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dDependent on the Reynolds number

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


aDecreases with increase in

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bIncreases with increase in

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cIs independent of

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dNone of these

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_______________ equation applies to diffusivities in liquids?


aGilliland

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bHirschfelder

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cWilke and Chang

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dNone of these

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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

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bPure gas

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cIdeal gas

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dSparingly soluble gas

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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

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b8.5 × 10-4

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c5.6 × 10-3

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d8.5 × 10-3

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View Answer 8.5 × 10-4

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