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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
90-100
30-40
70-80

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Mass Transfer
Large scale drying of sugar is done in a __________ dryer.

Rotary
Truck
Spouted bed
Tray

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Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

Both zero and hundred
Zero
None of these
Hundred

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

< 1
> 1
1

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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)

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

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Mass Transfer
Ammonia present in the coke oven gas is removed by washing with

Caustic solution
Ethanolamine
Dilute HCl
Dilute ammoniacal liquor

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