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Mass Transfer

Mass Transfer
Sand is dried in foundaries in a___drier.

Rotary
Spray
Vacuum
Fluidisedbed

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Mass Transfer
Diameter to height ratio for a rashig ring is

1
5
2
0.5

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Mass Transfer
Very tall packed towers are divided into series of beds to

Reduce liquid hold-up
Avoid channelling
Reduce the overall pressure drop
Avoid flooding

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D1.5
K ∝ D
K ∝ D2
K ∝ √D

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Mass Transfer
The Hatta number is important in

Binary distillation
Gas absorption without chemical reaction
Multicomponent distillation
Gas absorption with chemical reaction

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

Flooding
Liquid hold up
Liquid density
Gas viscosity

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MORE MCQ ON Mass Transfer

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