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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)

D
D0.5
D2
1/D

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Mass Transfer
In most of the vacuum crystalliser, vacuum is generally produced by means of a

Suction pump
Compressed air jet
Steam jet ejector with a barometric condenser
None of these

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Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Increases
Decreases
Remains unaffected
Passes through a maximum

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Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

10 metres above ground
2 metres above the ground
At ground level
5 metres above ground

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

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

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Mass Transfer
Which of the following is not a batch drier?

Vacuum shelf drier
Agitated pan drier
Truck drier
Fluidised bed drier

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