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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Higbie
Kissinevskii
Toor and Marchello
Danckwerts

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

5
2.5 to 3
3 to 4
1.2 to 1.5

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Mass Transfer
Fenske equation determines the

Minimum number of theoretical plates
Height of the distillation column
Maximum number of ideal plates
Optimum reflux ratio

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

None of these
Mass diffusivity to momentum diffusivity
Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity

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Mass Transfer
Boiling point diagram is

Affected by pressure
A plot of temperature vs. liquid composition
A plot of temperature vs. vapour composition
Not affected by pressure

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Mass Transfer
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

Natural draft cooling tower
Induced draft cooling tower
Spray chamber
None of these

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