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Mass Transfer

Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Long tube
Falling film
Vacuum
Short tube

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Mass Transfer
Very tall packed towers are divided into series of beds to

Reduce liquid hold-up
Avoid flooding
Reduce the overall pressure drop
Avoid channelling

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

Marginal decrease in the number of
No change in theoretical
None of the listed here
Major decrease in the number of

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Mass Transfer
Diffusion in concentrated solutins differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution.

Neither A nor B
Degree of ideality
Viscosity
Both A & B

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Mass Transfer
Separation of two volatile liquids by distillation makes use of their

Solubility
Density difference
Relative volatility
Selectivity

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Mass Transfer
Packed column distillation is limited to the column __________ metres.

Both A & B
Height < 6
Diameter < 0.6
Neither A nor B

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