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Mass Transfer

Mass Transfer
The fixed cost of a distillation column at minimum reflux ratio is

Minimum
None of these
Infinite
Optimum

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

Adsorption
Gas absorption
Humidification
Binary distillation

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Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is equal to the volumetric diffusivity
Is independent of pressure
Varies directly as the pressure
Varies inversely as the pressure

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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?

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

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No
Yes ; but height of cooling tower will be prohibitively high
Yes
Yes ; but the air flow rate should be excessively high

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Mass Transfer
Relative volatility does not change appreciably with the change in

Total pressure
Vapour pressure of either component
Temperature
None of these

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