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

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b-0.6

✖


c-1.5

✓


d0.6

✖


View Answer -1.5

In case of unsaturated air____________________?


aDew point < wet bulb temperature

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bWet bulb temperature < dry bulb temperature

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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

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bGas side

✓


cInterfacial

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dBoth liquid and gas side

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View Answer Gas side

Minimum reflux ratio in a distillation column results in__________________?


aOptimum number of trays

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bMinimum reboiler size

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cMaximum condenser size

✓


dMinimum number of trays

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Steady state equimolal counter diffusion is encountered in_____________________?


aSeparation of a binary mixture by distillation

✓


bAbsorption of NH3 from air by water

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cAll liquid-liquid diffusion systems

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dAll liquid-solid diffusion systems

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


aDiffusion co-efficient

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bMass transfer co-efficient

✓


cNTU

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dNone of these

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


aSpray

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bPacked

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cBubble cap plate

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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

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c5 metres above ground

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d10 metres above ground

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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

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cErosion of the tower

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dVery efficient operation

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


aLarge surface per unit volume

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bLarge free cross-section

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cLow weight per unit volume

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dLarge weight of liquid retained

✓



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