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Mass Transfer

Mass Transfer
Reverse osmosis is also called

Diffusion
Electrodilysis
Dialysis
Ultrafiltration

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Mass Transfer
The humid volume may be increased by increasing the

Temperature at constant humidity
Neither A nor B
Both A & B
Humidity at constant temperature

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

Bubble-cap column
Randomly packed column
Sieve-plate column
Packed column (stacked)

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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)

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

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Mass Transfer
Use of packed towers for distillation is generally limited to the

High pressure operation
Vacuum distillation
Multicomponent distillation
Small sizes

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Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Porosity
Cost
Size
Durability

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