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Mass Transfer

Mass Transfer
Dorr thickener is an equipment used for

Clarification
Sedimentation
Classification
Leaching

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Mass Transfer
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

0.152
0.079
0.122
0.048

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

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

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Mass Transfer
Leaching of sugar from sugar beets is done by

Hot water
Lime water
Dilute H₂SO₄
Hexane

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Mass Transfer
The adiabatic saturation curve for a vapour-gas mixture is

Slightly concave downward
Straight line
Slightly concave upward
None of these

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Mass Transfer
The rate of mass transfer is not dependent upon the

Both A & B
Interfacial surface exposed between the phases
None of these
Degree of dispersion of one fluid in the other

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