Chemical Engineering MCQs

Page No. 655

For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will_____________________?


aIncrease

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bDecrease

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cRemain same

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dData insufficient, can’t be predicted

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View Answer Increase

A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in respect of this mixture ?


aThe mixture exhibits an azeotrope at 101.3 kPa

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bThe composition of the mixture, in percent by volume is: o-xylene 30, p-xylene 60. and mxylene 10

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cThe composition of the mixture in mole percent is: o-xylene 30, p-xylene 60 and m-xyoene 10

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dThe mixture contain optical isomers

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In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of_______________________?


aArea between operating line and 45° diagonal x-y diagram

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bCondenser and reboiler surfaces

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cTower cross-section

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dNone of these

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Which of the following assumes constant molal vaporisation and overflow ?


aMcCabe-Thiele method

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bPonchan-Savarit method

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cEnthalpy concentration method

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dPlate absorption column

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View Answer McCabe-Thiele method

Which of the following binary systems is an example of a maximum boiling azeotrope ?


aWater-hydrochloric acid

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bAcetone-carbon disulphide

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cWater-ethyl alcohol

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dn-heptane-n-octane

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Channelling is most severe_____________________?


aIn towers packed with stacked packing

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bIn towers packed randomly with crushed solids

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cIn dumped packing of regular units

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dAt very high liquid flow rate

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When the liquid phase and vapour phase of a binary system obeys Raoult’s and Dalton’s law respectively, the relative volatility is the ratio of________________________?


aVapour pressure of component A to that of component B

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bVapour pressure of component A to the total pressure

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cVapour pressure of component A to the partial pressure of A

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dPartial pressure of component A to the total pressure

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Flooding in a column results due to___________________?


aHigh pressure drop

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bLow pressure drop

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cLow velocity of the liquid

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dHigh temperature

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View Answer High pressure drop

Raoult’s law is applicable to the_____________________?


aIdeal solutions

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bReal solutions

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cMixture of water and alcohol

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dNon-ideal gases

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View Answer Ideal solutions

Calcium ammonium nitrate (a fertiliser) is dried in a _________________ dryer?


aRotary

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bVacuum

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cTunnel

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dTray

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View Answer Rotary

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