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Mass Transfer

Mass Transfer
Dorr thickener is an equipment used for

Classification
Clarification
Leaching
Sedimentation

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Free
Unbound
Bound
Critical

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

< 1
1
> 1

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Mass Transfer
With increase in temperature, the rate of extraction in leaching (solid-liquid extraction system)

Decreases
Remains unaffected
Increases
Increases Linearly

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Mass Transfer
Which of the following is not a continuous leaching equipment?

Hydrocyclones
Bollman extractor
Kennedy extractor
Pachuka tank

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
1 and 0
< 1 and ≈ 1
>1 and ≈ 1

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