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Mass Transfer

Mass Transfer
Extraction of pencillin employs a __________ extraction coloumn.

Centrifugal
Packed
None of these
Plate

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

10
6.89
8.25
8.89

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Mass Transfer
The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

Increases
Decreases
Remains unchanged
May increase or decrease, depends on the system

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Mass Transfer
When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

None of these
Induced
Forced
Natural

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De.t)1/2
(4De/πt)1/2
(De/t)1/2
(4De/t)

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Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Volumetric diffusivity
Kinematic viscosity
Thermal diffusivity
Mass transfer co-efficient

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