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Mass Transfer

Mass Transfer
Sand is dried in foundaries in a___drier.

Rotary
Spray
Fluidisedbed
Vacuum

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Mass Transfer
Tower diameter may be decreased by

Increasing the liquid flow rate
Use of increased tray spacing
Using higher reflux ratio
Increasing the vapour flow rate

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Mass Transfer
In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

All of these
Liquid phase
Interface
Gas phase

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Mass Transfer
During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the

Liquid film
None of these
Gas film
Liquid-gas interface

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

1/P
1/√P
P
√P

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

All of these
Blowdown and leakage
Drift
Evaporation

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