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Mass Transfer

Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

More than
Half
Twice
Equal to

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Mass Transfer
In a binary system, separation is very efficient, when the relative volatility is

> 1
0.5
< 1
1

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Mass Transfer
Molality is defined as the number of gm moles of solute per __________ of solvent.

m³
Gm
Litre
Kg

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Mass Transfer
Very tall packed towers are divided into series of beds to

Reduce the overall pressure drop
Avoid flooding
Avoid channelling
Reduce liquid hold-up

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.122
0.079
0.048
0.152

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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.

Increases linearly
Decreases
Remains same
Increases

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