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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.

44119
30-40
90-100
70-80

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

F/(FG.a)
L/(FG.G)
FG/(G.a)
(G.a)/FG

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Mass Transfer
At 750°K and 1 atm, the approximate value of Schmidt number for air is

0.1
1
10
0.01

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

Increasing temperature
Decreasing pressure
No means
Increasing pressure

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Mass Transfer
For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.

Rotary
Tunnel
None of these
Tray

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

< 1 and ≈ 1
>1 and ≈ 1
0 and ≈ 1
1 and 0

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