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Mass Transfer

Mass Transfer
Large scale drying of wheat is done in a __________ dryer.

Fluidised bed
Tray
Vacuum rotary
Spouted bed

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Mass Transfer
For a binary mixture with low relative volatility,

Use steam distillation
Use high pressure distillation
Use molecular distillation
An azeotrope may be formed during distillation

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Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

None of these
Cracks develop on the surface of the solid
Rate of drying decreases abruptly
Surface evaporation of unbound moisture occurs

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Mass Transfer
Pressure drop through plate tower as compared to that through packed tower, for the same duty will be

Less
More
Equal
Either A or B; depends on the packing height

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Mass Transfer
With increase in temperature, the rate of leaching increases, because the

Viscosity of solvent decreases
Diffusivity of solute increases
None of these
Thermal conductivity of solute increases

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

FG/(G.a)
F/(FG.a)
(G.a)/FG
L/(FG.G)

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