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Mass Transfer

Mass Transfer
Deairation (removal of O₂) of water is done by

Absorption
Rectification
Adsorption
Ion-exchange

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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

1.04
1.24
1.94
0.54

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Mass Transfer
In stripping section of continuous distillation column, the

None of these
Liquid is enriched with high boiler
Liquid is stripped of high boiler
Vapour is stripped of low boiler

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Mass Transfer
The critical moisture content in case of drying indicates the __________ rate period.

Beginning of falling
End of falling
Beginning of constant
None of these

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Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Stanton number
Momentum diffusivity
Thermal diffusivity
Peclet number

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Mass Transfer
Dry bulb temperature of the gas is __________ the wet bulb temperature.

Equal to
More than
Less than
None of these

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