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Mass Transfer

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

1.2 to 1.5
5
3 to 4
2.5 to 3

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Zero
Minimum
Maximum
Infinite

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Mass Transfer
______ is the separation technique used for desalination of sea water.

Reverse osmosis
Adsorption
Thermal diffusion
Absorption

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Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Furfural
Benzol
Butyl acetate
Hexane

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Mass Transfer
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

Total
Minimum
Maximum permissible
Operating

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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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