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Mass Transfer

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

Re
Re0.53
Re0.33
Re0.83

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Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from gas to liquid phase
Unidirectional diffusion from liquid to gas phase
Either A or B
A counter diffusion at an almost equal molar rate

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Mass Transfer
Which of the following is used for the concentration of rubber latex?

Short tube evaporator
Long tube vertical evaporator
Agitated film evaporator
Calendria

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Mass Transfer
Lewis number (Le) is

St x Sh
Sc x Pr
Pr x St
Sh x Pr

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

No change in theoretical
Major decrease in the number of
Marginal decrease in the number of
None of the listed here

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

3 to 4
2.5 to 3
1.2 to 1.5
5

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