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Mass Transfer

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

K ∝ D
K ∝ √D
K ∝ D2
K ∝ D1.5

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

+ ve
-1
1
- ve

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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
In the constant rate period of the rate of drying curve for batch drying,

Cracks develop on the surface of the solid
Rate of drying decreases abruptly
Surface evaporation of unbound moisture occurs
None of these

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Raising the temperature
Neither A nor B
Both A & B
Lowering the total pressure

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
< 1 and ≈ 1
>1 and ≈ 1
1 and 0

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