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Mass Transfer

Mass Transfer
Sand is dried in foundaries in a___drier.

Fluidisedbed
Rotary
Vacuum
Spray

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

Remains unaffected
Increases
Decreases
And the heat required in reboiler decreases

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Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

91.5
95
90
99

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Mass Transfer
Drying operation under vacuum is carried out to

Reduce drying temperature
Dry materials having high bound moisture content
Dry those materials which have very high unbound mositure content
Increase drying temperature

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

A total condenser is used
An azeotrope forms
Saturated feed is not used
The latent heat of vaporisation of the more and less volatile components are greatly different

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Mass Transfer
Ordinary diffusion process is also called __________ diffusion.

Forced
Thermal
Pressure
Concentration

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