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Mass Transfer

Mass Transfer
Free flowing granular materials can be best dried in a __________ drier.

Rotary
Freeze
Drun
Cylinder

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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)

8.89
10
6.89
8.25

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Mass Transfer
In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

Liquid
Both A & B
Neither A nor B
Gas

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Mass Transfer
Unit of molal diffusivity is

Gm moles/cm² . sec
Gm moles/cm². sec
Gm moles/cm. sec
Cm²/sec gm . mole

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

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

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Mass Transfer
Sand is dried in foundaries in a___drier.

Vacuum
Fluidisedbed
Rotary
Spray

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