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Mass Transfer

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

1/f
F/2
2f
F

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Mass Transfer
Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C?

Evaporative cooling
Both heating and humidification
Heating only
Humidification only

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Mass Transfer
The value of NA/(NA + NB) for steady state molecular diffusion of gas 'A' through non-diffusing gas 'B' is

2
∞
0.5
1

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Decreases
Increases linearly
Remains same
Increases

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Mass Transfer
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.

Bound
Unbound
Critical
Free

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Mass Transfer
Tower diameter may be decreased by

Using higher reflux ratio
Increasing the liquid flow rate
Use of increased tray spacing
Increasing the vapour flow rate

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