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Mass Transfer

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

2.5 to 3
3 to 4
1.2 to 1.5
5

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Mass Transfer
The most economical range of absorption factor is

2.5 to 3
1.25 to 2
5 to 10
2 to 2.5

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Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

10 metres above ground
2 metres above the ground
5 metres above ground
At ground level

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Mass Transfer
Steady state equimolal counter diffusion is encountered in

All of these
All liquid-liquid diffusion systems
Absorption of NH₃ from air by water
Separation of a binary mixture by distillation

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

Thermal diffusion
Absorption
Adsorption
Reverse osmosis

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Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

D
D1.5
1/D
D0.5

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