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Mass Transfer

Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

44119
30-40
70-80
90-100

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Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T3/2 and √T
√T and T3/2
T and T3/2
T3/2 and T

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Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

A counter diffusion at an almost equal molar rate
Unidirectional diffusion from liquid to gas phase
Either A or B
Unidirectional diffusion from gas to liquid phase

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Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Feed composition
Allowable gas and liquid velocities
Allowable gas velocity
Allowable liquid velocity

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Mass Transfer
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

May increase or decrease ; depends on individual design
Decreases
Remains same
Increases

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Mass Transfer
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

At > 210.6
At < 100
None of the listed here
Between 100 and 210

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