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Mass Transfer

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

Half
Twice
Equal to
More than

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

500
1000
100
50

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Mass Transfer
With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)

Decreases linearly
Remains unchanged
Decreases
Increases

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Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

Insoluble in the liquid
Non-ideal in nature
At a fixed temperature
Soluble in the liquid

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Thermal decomposition of bottoms
Increased relative volatility
Very efficient operation
Erosion of the tower

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Mass Transfer
Steam distillation is used for separation of high boiling

Volatile impurity from still higher boiling substances
Substances from non-volatile impurities
none of the listed here
Both of the options given here

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