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Mass Transfer

Mass Transfer
Rose oil is extracted from rose leaves using __________ distillation.

Low pressure
Extractive
Steam
High pressure

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Mass Transfer
Boiling point diagram is

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

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = Re/(1 + Re)
Ri = Re
Ri = (1 - Re)/Re

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Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Gas absorption
Humidification
Adsorption
Binary distillation

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Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Evaporation
Adsorption
Dehydration
Sublimation

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Mass Transfer
During the constant rate period of drying of a solid,

Increased air humidity decreases the rate of drying
None of these
Increasing the air temperature decreases the drying rate
Surface evaporation of unbound moisture occurs

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