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Mass Transfer

Mass Transfer
Dorr thickener is an equipment used for

Leaching
Sedimentation
Classification
Clarification

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Mass Transfer
Drift in a cooling tower is

All of these
Desirable
Dependent on the water lost by evaporation
The water entrained by the circulating air

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Mass Transfer
Physical absorption is

Accompanied by evolution of heat
Both B & C
An irreversible phenomenon
A reversible phenomenon

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A total condenser is used
The latent heat of vaporisation of the more and less volatile components are greatly different
An azeotrope forms
Saturated feed is not used

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Mass Transfer
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

6
10
8
12

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Mass Transfer
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

Inversely
Linearly
None of these
Exponentially

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