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Mass Transfer

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

None of these
50
100
78

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
9
1
8

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Mass Transfer
Which of the following binary systems is an example of a maximum boiling azeotrope?

Acetone-carbon disulphide
Water-ethyl alcohol
Water-hydrochloric acid
None of the listed here

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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)

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

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Mass Transfer
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is

Calculated
Unknown
Known
Not required

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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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