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Mass Transfer

Mass Transfer
Stefan's law describes the mass transfer by

Diffusion
Bulk flow
Neither A nor B
Both A & B

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Mass Transfer
The cooling effect in a cooling tower can not be increased by

Increasing the air velocity over the wet surfaces
None of these
Lowering the barometric pressure
Reducing the humidity of entering air

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Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of ideal plates to actual plates
Same as the Murphree efficiency
The ratio of number of actual plates to ideal plates
Always more than the point efficiency

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Mass Transfer
Large scale drying of sugar is done in a __________ dryer.

Rotary
Tray
Spouted bed
Truck

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Mass Transfer
Cox chart is useful in the design of

Dryer
Evaporator
Crystalliser
Distillation column

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

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

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