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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

T²
√T
1/T
T

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Mass Transfer
In liquid-liquid extraction, the number of phases at plait point is

3
4
2
1

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Mass Transfer
Swenson-Walker crystalliser is a __________ unit

Batch
Cooling (adiabatic)-cum-evaporation
Continuous
Semi-batch

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Mass Transfer
The caking of crystals can be prevented by

Maintaining low critical humidity
Both A and C
Coating the product with inert material
Maintaining high critical humidity

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

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

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NPr = NLe
NSc = NLe
NSc = 1
NSc = NPr = NLe

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