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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.

70-80
90-100
44119
30-40

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Mass Transfer
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.

Either A, or B ; depends on the type of packing
Smaller than
Equal to
Greater than

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Mass Transfer
Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture.

Bound
Critical
Unbound
None of these

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

Dependent on the Reynolds number
D/a
Proportional to √D
D/2a

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Sharp rise in pressure drop
None of these
Increase in flow rate
Sharp drop in pressure drop

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Mass Transfer
Sticky material can be dried in a __________ dryer.

None of these
Rotary
Tray
Fluidised bed

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