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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D2
1/D
D0.5
D

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Free
Bound
Critical
Unbound

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Mass Transfer
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

Exponentially
None of these
Linearly
Inversely

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Thermal decomposition of bottoms
Erosion of the tower
Very efficient operation
Increased relative volatility

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Mass Transfer
Lewis number (Le) is

Pr x St
Sc x Pr
St x Sh
Sh x Pr

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Mass Transfer
Antibiotics are best handled in a

Rotating disc contactor
Sieve tray contractor
Pulsed column extractor
Podbielniak extractor

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