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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Danckwerts
Stefan
Fick
Toor and Marchello

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Mass Transfer
The dimension of diffusivity is same as that of the

Density
Velocity head
Kinematic viscosity
Molal concentration

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Mass Transfer
In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.

Azeotropic
Flash
Extractive
Molecular

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Mass Transfer
With increase in pressure, the relative volatility for a binary system

Remains same
Decreases
Either A or B, depends on the system
Increases

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T
√T
T²
T³

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Mass Transfer
Rotary dryers cannot handle __________ materials.

Sticky
Dry
Free flowing
Grannular

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