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Mass Transfer

Mass Transfer
Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

100
50
None of these
78

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re/(1 + Re)
Ri = (1 - Re)/Re
Ri = Re
Ri = Re/(1 - Re)

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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)

8.89
6.89
8.25
10

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Mass Transfer
During drying of a solid, the critical moisture content increases with

Increased thickness of the solid
Both B and C
Decreased drying rate
Increased drying rate

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Mass Transfer
Which of the following provides maximum contact surface for a liquid-vapour system?

Wetted wall column
Packed tower
Seive-plate column
Bubble-cap plate column

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Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Plate towers
Packed towers
Wetted wall columns
Spray towers

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