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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

2f
1/f
F/2
F

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Mass Transfer
Which of the following decreases during evaporative cooling process with recirculated water supply?

Wet bulb temperature
None of these
Relative humidity
Partial pressure of vapour

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Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
The ratio of number of ideal plates to actual plates
Same as the Murphree efficiency
Always more than the point efficiency

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Mass Transfer
Steady state equimolal counter diffusion is encountered in

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

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

7
70
150
0.7

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.

Perfectly mixed
None of the listed here
Plug
Both plug & perfectly mixed

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