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Mass Transfer

Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

1
< 1
> 1

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

Vacuum rotary
Tray
Fluidised bed
Spouted bed

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

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Mass Transfer
The Hatta number is important in

Gas absorption without chemical reaction
Multicomponent distillation
Gas absorption with chemical reaction
Binary distillation

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

Spouted bed
Truck
Tray
Rotary

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
1 and 0
>1 and ≈ 1
< 1 and ≈ 1

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MORE MCQ ON Mass Transfer

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