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Mass Transfer

Mass Transfer
__________ columns are used for liquid dispersion in a continuous gas phase.

Pulse
Bubble cap
Packed
Sieve plate

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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)

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

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T³
√T
T
T²

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Mass Transfer
Paper industry employs __________ driers.

Spray
Rotary
Fluidised bed
Cylinder

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Mass Transfer
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Greater than
Either A, or B ; depends on the type of packing
Equal to
Smaller than

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Mass Transfer
Desirable value of absorption factor in an absorber is

1
> 1
< 1
0.5

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