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Mass Transfer

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

> 1
10-5 to 10-6
0.01
0.1

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Mass Transfer
Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in __________ tower.

Wetted wall
Packed
Perforated tray
Bubble cap

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Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

Indirect tray
Spray
None of these
Freeze

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Mass Transfer
As the reflux ratio increases, the slope of the operating line for rectifying section

Decreases
Data insufficient, cannot be predicted
Remains constant
Increases

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Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Centrifugal extractor
Pulsed extractor
Packed extraction tower
Mixer-settler extractor

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Mass Transfer
Which of the following solutions will follow Raoult's law most closely?

A solution of polar organic compounds (not of homologs of a series)
35% solution of NH₃ in water
A solution of benzene, toluene and oxylene
35% solution of camphor in water

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