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Mass Transfer

Mass Transfer
Unit operation involved in the prilling of urea is

Drying
Evaporation
Both B and C
Crystallisation

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Mass Transfer
Mass transfer co-efficient 'K' according to penetration theory varies with mass dif-fusivity as

1/D
D1.5
D0.5
D

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

T1.5
T
√T
T3

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Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable gas and liquid velocities
Feed composition
Allowable gas velocity
Allowable liquid velocity

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Mass Transfer
Molecular seives are regenerated by heating to __________ °C.

< 150
200-330
> 1000
> 500

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P1.5
D ∝ 1/P0.5
D ∝ 1/P
D ∝ P0.5

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