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Mass Transfer

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

1
- ve
-1
+ ve

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Mass Transfer
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)

Log P vs. log T
P vs . log T
Log P vs . T
T vs . P

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

70
7
0.7
150

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Mass Transfer
Mass transfer co-efficient is defined as

Co-efficient = Flux/concentration difference
None of the listed here
Flux = Co-efficient/concentration difference
Flux=concentration difference/co-effi-cient

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Mass Transfer
The humid volume may be increased by increasing the

Both A & B
Neither A nor B
Humidity at constant temperature
Temperature at constant humidity

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Mass Transfer
When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

Always higher than
Always lower than
Same as
Dependent on the system; can be either lower or higher than

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