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Mass Transfer

Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

> 1
0.5
1
< 1

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Mass Transfer
Swenson-Walker crystalliser is a __________ unit

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

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Mass Transfer
In case of constant underflow extraction operation, the __________ at all solute concentration.

Solids are drained to the same extent
Neither A nor B
Both A & B
Ratio of the insoluble to solution is constant

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

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

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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
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

2.5
1.25
0.0025
0.25

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