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Mass Transfer

Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

P
√P
1/P
1/√P

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Mass Transfer
Drift in a cooling tower is

All of these
Dependent on the water lost by evaporation
The water entrained by the circulating air
Desirable

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

Flow rate of entering liquid
None of the listed here
Flow rate of gas
Heat gain or loss

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

Saturated feed is not used
A total condenser is used
An azeotrope forms
The latent heat of vaporisation of the more and less volatile components are greatly different

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Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

99
95
90
91.5

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

+ ve
-1
- ve
1

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