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Mass Transfer

Mass Transfer
Weight of 1 m³ of humid air as compared to 1 m³ of dry air, under the same conditions, is

Same
Unpredictable
More
Less

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Mass Transfer
When an unsaturated air-water mixture is heated at constant pressure, then

The relative humidity decreases
The relative humidity increases
The specific humidity decreases
The partial pressure of water vapour increases

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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
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D2
K ∝ D
K ∝ D1.5
K ∝ √D

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

0.54
1.04
1.94
1.24

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T²
√T
T³
T

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