Mass Transfer
Flights in a rotary dryer are provided to

Increase the residence time of the solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
None of these
Reduce the residence time of solid

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Mass Transfer
For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.

Ternery mixture is represented by the sides
Binary mixture is represented by the apex
Pure component is represented by the apex
Binary mixture is represented by any point inside

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

Viscosity of liquid components is very high
One of the liquid components has very high affinity towards the solvent
One of the liquid components is heat sensitive
Extracting solvent is cheaply & abundantly available

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