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Mass Transfer

Mass Transfer
Leaching of coffee from coffee beans is done by

Hot water
Dilute H₂SO₄ (hot)
Hexane
Lime water

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Mass Transfer
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

2
3
1
4

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Mass Transfer
In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at __________ reflux.

Minimum
Total
Operating
Maximum permissible

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Bubble cap tower
Wetted wall tower
Perforated tray tower
Grid tray tower

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

10
8.89
6.89
8.25

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Mass Transfer
All moisture in a non-hygroscopic material is the __________ moisture.

Free
Unbound
Bound
Equilibrium

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