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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Film
Surface renewal
None of these
Penetration

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

√P
1/√P
P
1/P

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Mass Transfer
Minimum possible diameter of a packed coloumn is decided mainly by the

Liquid hold up
Gas viscosity
Liquid density
Flooding

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Mass Transfer
The most economical range of absorption factor is

2 to 2.5
1.25 to 2
2.5 to 3
5 to 10

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Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T3/2 and √T
T3/2 and T
T and T3/2
√T and T3/2

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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 )

T³
√T
T
T²

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