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Mass Transfer

Mass Transfer
What is the reflux ratio at total reflux?

Infinity
Unity
Zero
Data insufficient

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

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

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Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

None of these
Dehumidified
Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

1
0.72
0.24
0.6

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Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ²
1/μ
μ
√μ

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Mass Transfer
The recovery of pencillin from the acidified fermentation broth is done by

Liquid extraction
Absorption
Distillation
Evaporation

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