Chemical Engineering MCQs

Page No. 676

In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________?


a1.5


b-0.6


c-1.5


d0.6


View Answer -1.5

In case of unsaturated air____________________?


aDew point < wet bulb temperature


bWet bulb temperature < dry bulb temperature


cBoth A. and B.


dNeither A. not B.


View Answer Both A. and B.

The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?


aLiquid side


bGas side


cInterfacial


dBoth liquid and gas side


View Answer Gas side

Minimum reflux ratio in a distillation column results in__________________?


aOptimum number of trays


bMinimum reboiler size


cMaximum condenser size


dMinimum number of trays



Steady state equimolal counter diffusion is encountered in_____________________?


aSeparation of a binary mixture by distillation


bAbsorption of NH3 from air by water


cAll liquid-liquid diffusion systems


dAll liquid-solid diffusion systems



Experimental determination of _______________ is done by wetted wall column method?


aDiffusion co-efficient


bMass transfer co-efficient


cNTU


dNone of these



Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a ________________ column?


aSpray


bPacked


cBubble cap plate


dWetted wall


View Answer Wetted wall

In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?


aAt ground level


b2 metres above the ground


c5 metres above ground


d10 metres above ground


View Answer At ground level

High pressure at the bottom of a distillation tower handling heat sensitive materials results in _____________________?


aThermal decomposition of bottoms


bIncreased relative volatility


cErosion of the tower


dVery efficient operation



Which of the following is an undesirable property in a tower packing ?


aLarge surface per unit volume


bLarge free cross-section


cLow weight per unit volume


dLarge weight of liquid retained



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