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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
10-5 to 10-6
> 1
0.1

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Mass Transfer
Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.

None of these
Plate
Packed
Baffle

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

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

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

Falling film
Long tube
Short tube
Vacuum

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P1.5
D ∝ 1/P
D ∝ 1/P0.5
D ∝ P0.5

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Mass Transfer
The cooling effect in a cooling tower can not be increased by

Lowering the barometric pressure
Reducing the humidity of entering air
None of these
Increasing the air velocity over the wet surfaces

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