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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re
Re0.83
Re0.33

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Mass Transfer
Selectivity of the solvent used in solvent extraction should be

> 1
1
< 1

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Mass Transfer
Prandtl number for water at 20°C is about

70
7
150
0.7

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

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

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Mass Transfer
Sticky material can be dried in a __________ dryer.

Fluidised bed
Rotary
Tray
None of these

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Mass Transfer
In gas-liquid contact operation, the number of ideal stages, N = (xa - xb)/(xb - x*b) . This is true when the stripping factor 'S' is

S > 1
S = 1
S = ∞
S < 1

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