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MASS TRANSFER

Mass Transfer
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

None of these
Remains unchanged
Decreases
Increases

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

(G.a)/FG
FG/(G.a)
F/(FG.a)
L/(FG.G)

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

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

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Mass Transfer
Cox chart is useful in the design of

Crystalliser
Evaporator
Dryer
Distillation column

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Momentum diffusivity to the thermal diffusivity
Momentum diffusivity to the mass dif-fusivity
Thermal diffusivity to the mass diffusivity
None of these

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