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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F
2f
F/2
1/f

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Mass Transfer
At minimum reflux ratio for a given separation

Number of plates is zero
Separation is most efficient
Number of plates is infinity
Minimum number of the theoretical plates is required

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Mass Transfer
As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches

None of these
That of normal condensation
Integral heat of adsorption
Zero

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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.

Perforated tray
Wetted wall
Bubble cap
Packed

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Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

2
1
∞
0.5

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

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