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Mass Transfer

Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

None of these
78
100
50

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Mass Transfer
If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is

0.017
0.107
0.31
0.215

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Mass Transfer
The unit of volumetric diffusivity is

Cm/sec
Cm²/sec
Cm²/seC₂
Cm³/sec

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Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Kissinevskii
Higbie
Toor and Marchello
Danckwerts

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Bubble cap tower
Wetted wall tower
Grid tray tower
Perforated tray tower

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Mass Transfer
Under conditions of flooding in packed tower, the gas pressure drop

Is maximum
Increases rapidly
Decreases rapidly
Remains constant

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