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

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bBubble cap column

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cRandomly packed column

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dWetted wall column

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View Answer Wetted wall column

Dryer widely used in a textile industry is ______________ dryer?


aFestoon

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bCylinder

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cConveyor

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dTunnel

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View Answer Conveyor

Ponchon-Savarit method analyses the fractional equipment based on___________________?


aEnthalpy balance only

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bMaterial balance only

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cBoth enthalpy and material balances

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dThe assumption of constant molal-overflow

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


aFlooding

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bGas viscosity

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cLiquid density

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dLiquid hold up

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View Answer Flooding

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


aDecreases in winter

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bIncreases in winter

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cIncreases in summer

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dNone of these

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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

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b1

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c2

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d3

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View Answer 0

Entrainer used in Azeotropic distillation should____________________?


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

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

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cHave high latent heat of vaporisation

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dHave high viscosity to provide high tray efficiency

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


aOperating line lies above the equilibrium line

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bOperating line lies below the equilibrium line

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cBoth operating and equilibrium lines are parallel

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dPressure drop in the column is very high

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


aBubble-cap column

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bSieve-plate column

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cPacked column (stacked)

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dRandomly packed column

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


aSensible heat changes are negligible compared with latent heat changes

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bMolar latent heats of all components are equal

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cHeat of mixing is negligible

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dNone of these

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View Answer None of these

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