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Mass Transfer

Mass Transfer
Unit operation involved in the prilling of urea is

Drying
Both B and C
Crystallisation
Evaporation

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Mass Transfer
For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.

Neither A nor B
Both A & B
Constant rate
Unsaturated surface

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 - Re)
Ri = (1 - Re)/Re
Ri = Re/(1 + Re)
Ri = Re

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Mass Transfer
At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

Minimum
Operating
Total
Maximum permissible

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Dynamic viscosity
Pressure
Kinematic viscosity
Surface tension

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Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Volumetric diffusivity
Kinematic viscosity
Mass transfer co-efficient
Thermal diffusivity

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