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


bDecrease


cRemain same


dData insufficient, can’t be predicted


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


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


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


dThe mixture contain optical isomers



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


bCondenser and reboiler surfaces


cTower cross-section


dNone of these



Which of the following assumes constant molal vaporisation and overflow ?


aMcCabe-Thiele method


bPonchan-Savarit method


cEnthalpy concentration method


dPlate absorption column


View Answer McCabe-Thiele method

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


aWater-hydrochloric acid


bAcetone-carbon disulphide


cWater-ethyl alcohol


dn-heptane-n-octane



Channelling is most severe_____________________?


aIn towers packed with stacked packing


bIn towers packed randomly with crushed solids


cIn dumped packing of regular units


dAt very high liquid flow rate



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


bVapour pressure of component A to the total pressure


cVapour pressure of component A to the partial pressure of A


dPartial pressure of component A to the total pressure



Flooding in a column results due to___________________?


aHigh pressure drop


bLow pressure drop


cLow velocity of the liquid


dHigh temperature


View Answer High pressure drop

Raoult’s law is applicable to the_____________________?


aIdeal solutions


bReal solutions


cMixture of water and alcohol


dNon-ideal gases


View Answer Ideal solutions

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


aRotary


bVacuum


cTunnel


dTray


View Answer Rotary

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