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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Stefan
Danckwerts
Fick
Toor and Marchello

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Mass Transfer
Which of the following decreases during evaporative cooling process with recirculated water supply?

None of these
Partial pressure of vapour
Relative humidity
Wet bulb temperature

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NSc = NPr = NLe
NSc = 1
NPr = NLe
NSc = NLe

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

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

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Mass Transfer
Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour P = vapour pressure of the liquid )

P < P
P
P >>P
P = P

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Mass Transfer
The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an __________ law.

Cubic
Exponential
Parabolic
Linear

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