Chemical Engineering MCQs

Page No. 677

Which of the following is directly concerned with Psychrometry ?


aLewis relationship

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bGalileo number

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cWeber number

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dDean number

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View Answer Lewis relationship

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


a1

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b0

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c∞

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dNone of these

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View Answer ∞

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


aCaustic solution

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bDilute ammoniacal liquor

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cDilute HCl

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dEthanolamine

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


aNo change in theoretical

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bMarginal decrease in the number of

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cMajor decrease in the number of

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dNone of these

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Lewis number (Le) is___________________?


aSc × Pr

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bPr × St

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cSh × Pr

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dSt × Sh

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View Answer Sc × Pr

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


aSize

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bDurability

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cPorosity

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dCost

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View Answer Porosity

To get high tray efficiency___________________?


aInterfacial surface between liquid and gas phase should be large

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bTime of contact between the two phases should be less

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cGas velocity should be very low

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dLiquid entrainment should be severe

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


aLiquid stream should be distributed uniformly

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bGas stream should be distributed uniformly

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cBoth gas as well as liquid streams should be distributed uniformly

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dBy passing should be completely avoided

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


a0

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b∞

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c-ve

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d+ve

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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

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bBinary mixture is represented by any point inside

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cTernary mixture is represented by the sides

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dPure component is represented by the apex

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