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Mass Transfer

Mass Transfer
Reverse osmosis is also called

Diffusion
Dialysis
Electrodilysis
Ultrafiltration

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Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

1/D
D0.5
D
D2

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Liquid hold up
Gas viscosity
Liquid density
Flooding

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Evaporative cooling
Heating only
Humidification only
Both heating and humidification

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
Remains unaffected
And the heat required in reboiler decreases
Increases

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Very efficient operation
Thermal decomposition of bottoms
Erosion of the tower
Increased relative volatility

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