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Mass Transfer

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

F
F/2
1/f
2f

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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.

0.0025
1.25
2.5
0.25

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Mass Transfer
Sticky material can be dried in a __________ dryer.

Fluidised bed
Tray
Rotary
None of these

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Mass Transfer
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

Heat of wetting
None of these
Integral heat of adsorption
Differential heat of adsorption

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Zero
Maximum
Minimum
Infinite

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Mass Transfer
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is

∞
+ve
-ve

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