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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

95
91.5
99
90

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Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Have very wide boiling points
Form constant boiling azeotrope
Have very close boiling points
Form minimum boiling azeotrope

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Mass Transfer
The wet and 'dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be __________ °C.

-25
< 25
> 25
25

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
Proportional to √D
D/a
Dependent on the Reynolds number

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Mass Transfer
Steam distillation is used to separate

Mixtures of low relative volatility
High boiling substances from nonvolatile impurities
Heat sensitive materials
Azeotropes

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Mass Transfer
The equipment used in the extraction of highly corrosive radio active liquids is

Mixer settler
Baffle tower
Spray column
Pulse column

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