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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Toor and Marchello
Fick
Stefan
Danckwerts

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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
Diameter to height ratio for a rashig ring is

5
0.5
2
1

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Mass Transfer
Sticky material can be dried in a __________ dryer.

Rotary
None of these
Fluidised bed
Tray

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

Molal concentration
Velocity head
Kinematic viscosity
Density

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Mass Transfer
In azeotropic mixture, the equilibrium vapour composition is

Same as liquid composition
None of the listed here
Less than liquid composition
More than liquid composition

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