Chemical Engineering MCQs

Page No. 677

Which of the following is directly concerned with Psychrometry ?


aLewis relationship


bGalileo number


cWeber number


dDean number


View Answer Lewis relationship

At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes______________________?


a1


b0


c


dNone of these


View Answer

Ammonia present in the coke oven gas is removed by washing with___________________?


aCaustic solution


bDilute ammoniacal liquor


cDilute HCl


dEthanolamine



For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ____________________ plate requirement?


aNo change in theoretical


bMarginal decrease in the number of


cMajor decrease in the number of


dNone of these



Lewis number (Le) is___________________?


aSc × Pr


bPr × St


cSh × Pr


dSt × Sh


View Answer Sc × Pr

Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?


aSize


bDurability


cPorosity


dCost


View Answer Porosity

To get high tray efficiency___________________?


aInterfacial surface between liquid and gas phase should be large


bTime of contact between the two phases should be less


cGas velocity should be very low


dLiquid entrainment should be severe



In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________?


aLiquid stream should be distributed uniformly


bGas stream should be distributed uniformly


cBoth gas as well as liquid streams should be distributed uniformly


dBy passing should be completely avoided



The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is__________________?


a0


b


c-ve


d+ve


View Answer -ve

For a ternary mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a _______________ of the equilateral triangular co-ordinates?


aBinary mixture is represented by the apex


bBinary mixture is represented by any point inside


cTernary mixture is represented by the sides


dPure component is represented by the apex



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