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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
70-80
30-40
90-100

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

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Mass Transfer
With increase in temperature, the leaching rate increases because of the

None of the listed here
Decreased viscosity of liquid
Increased diffusivity
Both Decreased viscosity of liquid & Increased diffusivity

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Mass Transfer
At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes

?
None of these
1

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Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

KL²/DA
√(KL².DA)
KL/DA²
KL².DA

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Mass Transfer
The process employing desorption of the absorbed solute by a solvent is called

Osmosis
Reverse osmosis
Sublimation
Elution

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