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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

5
2
1
0.5

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De/t)1/2
(4De/πt)1/2
(De.t)1/2
(4De/t)

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Mass Transfer
Decoction refers to the use of solvent

At its boiling point
In its vapor form
At ambient temperature
None of these

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

None of these
a₁ = 0.5 a₂
a₁ = 2a₂
a₁ = a₂

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Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Increases in summer
None of these
Decreases in winter
Increases in winter

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Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

Heat gain or loss
None of the listed here
Flow rate of entering liquid
Flow rate of gas

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