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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Film
Surface renewal
Penetration
None of these

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Mass Transfer
Which of the following is considered equivalent to one theoretical stage in Mc-Cabe Thiele's method?

Reboiler
Total condenser
Partial condenser
Both B and C

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of helium
Isotopes of uranium
N₂ and O₂ from air
SO₂ and air

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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 minimum number of theoretical plates is required for achieving a given separation in distillation column with

No reflux
Minimum reflux ratio
Total reflux
Zero reflux ratio

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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
1.94
0.54
1.24

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