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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

0.6
-1.5
1.5
-0.6

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

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

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Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

90-100
30-40
70-80
44119

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

All of these
Interface
Liquid phase
Gas phase

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Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

Infinity
Unity
Zero
None of these

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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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