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Mass Transfer

Mass Transfer
Leaching rate is independent of the

None of the listed here
Particle size
Agitation
Temperature

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
Proportional to √D
D/a
Dependent on the Reynolds number

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Neither A nor B
Unsaturated surface
Constant rate
Both A & B

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Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F
F/2
2f
1/f

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Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Packed
Bubble cap
Wetted wall
Perforated tray

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

Natural
Induced
None of these
Forced

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