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Mass Transfer

Mass Transfer
What is the reflux ratio at total reflux?

Infinity
Zero
Unity
Data insufficient

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

No means
Increasing temperature
Decreasing pressure
Increasing pressure

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Mass Transfer
Drift in a cooling tower is

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

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Mass Transfer
The film penetration model of mass transfer was enunciated by

Fick
Gilliland
Stefan
Toor and Marchello

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De/t)1/2
(4De/πt)1/2
(De.t)1/2
(4De/t)

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Calculated
Not required
Known
Unknown

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