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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm³/sec
Cm/sec
Cm²/seC₂
Cm²/sec

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Mass Transfer
The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same sytem is

10
5
1
100

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Mass Transfer
Back-trapping in a distillation column

Reduces pressure drop
Increases tray efficiency
Is desirable, as it provides improved vapour-liquid contact
Decreases tray efficiency

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Mass Transfer
Which of the following increases during evaporative cooling process with recirculated water supply?

Partial pressure of vapour
Wet bulb temperature
Relative humidity
Both B and C

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Mass Transfer
Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent

A ternary mixture
Partially miscible ternary system
A binary mixture
A pure component

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
1.25
0.0025
2.5

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