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
Pick out the wrong statement pertaining to the rotary dryer.

Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12%
Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.
Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Rotary dryer is suitable for drying sticky material

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Mass Transfer
To get high tray efficiency

Gas velocity should be very low
Interfacial surface between liquid and gas phase should be large
Liquid entrainment should be severe
Time of contact between the two phases should be less

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