Chemical Engineering MCQs

Page No. 641

Which of the following liquid-vapor contacting devices provides maximum contact surface area for a particular duty ?


aSieve plate column


bBubble cap column


cRandomly packed column


dWetted wall column


View Answer Wetted wall column

Dryer widely used in a textile industry is ______________ dryer?


aFestoon


bCylinder


cConveyor


dTunnel


View Answer Conveyor

Ponchon-Savarit method analyses the fractional equipment based on___________________?


aEnthalpy balance only


bMaterial balance only


cBoth enthalpy and material balances


dThe assumption of constant molal-overflow



Minimum possible diameter of a packed column is decided mainly by the________________________?


aFlooding


bGas viscosity


cLiquid density


dLiquid hold up


View Answer Flooding

For the same process conditions, the reflux ratio of an unlagged distillation column___________________?


aDecreases in winter


bIncreases in winter


cIncreases in summer


dNone of these


View Answer Increases in winter

A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternary system containing two pairs of partially miscible liquids ?


a0


b1


c2


d3


View Answer 0

Entrainer used in Azeotropic distillation should____________________?


aForm a low boiling azeotrope with one of the constituents of the mixture


bForm a new azeotrope of low relative volatility with one of the constituents of the mixture


cHave high latent heat of vaporisation


dHave high viscosity to provide high tray efficiency



Absorption factor method is used to calculate the number of ideal stages, when_______________________?


aOperating line lies above the equilibrium line


bOperating line lies below the equilibrium line


cBoth operating and equilibrium lines are parallel


dPressure drop in the column is very high



Which of the following same diameter columns gives lowest pressure drop per unit height ?


aBubble-cap column


bSieve-plate column


cPacked column (stacked)


dRandomly packed column



McCabe-Thiele method of binary distillation does not assume that the__________________?


aSensible heat changes are negligible compared with latent heat changes


bMolar latent heats of all components are equal


cHeat of mixing is negligible


dNone of these


View Answer None of these

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