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Mass Transfer

Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

0.01
1
0.1
10

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Mass Transfer
Molecular diffusivity of a liquid

May increase or decrease with temperature
Increases with temperature
Decreases with temperature
Is independent of temperature

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ri) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 - Ro) = Ro/Ri

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Mass Transfer
What is the degree of freedom of an absorption process in which only one component is transferred between phases?

1
3
4
2

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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
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

43835
22190
200-300
> 500

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