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Mass Transfer

Mass Transfer
Paper industry employs __________ driers.

Rotary
Spray
Cylinder
Fluidised bed

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Mass Transfer
Only small amount of evaporation of water produces large cooling effects because of its

None of these
Large latent heat
Small latent heat
Low viscosity

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Mass Transfer
Back-trapping in a distillation column

Is desirable, as it provides improved vapour-liquid contact
Decreases tray efficiency
Reduces pressure drop
Increases tray efficiency

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Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

0.5
2
1
∞

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

9.21
100
0.001
4.605

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Mass Transfer
Unit of molal diffusivity is

Gm moles/cm². sec
Gm moles/cm² . sec
Cm²/sec gm . mole
Gm moles/cm. sec

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