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Mass Transfer

Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

> 1
0.5
1
< 1

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Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

50
Between 0 and 100
100

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Mass Transfer
Schmidt number is given by

Re/Pe
Re.Pe
Sh x Pe
Μ/ρDAB

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Relative humidity of outlet air
Humidity of inlet air
Flow rate of inlet air
Temperature of the solid

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Increases with time
Does not change with time
Does not affect the moisture content of the wet solid
Decreases with time

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Mass Transfer
In batch distillation with constant reflux, overhead product composition __________ with time.

May increase on decrease, depends on the system
Decreases
Increases
Does not vary

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