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Chemical Engineering - Mass Transfer

Exercise

"Loneliness is the most terrible poverty."
- Mother Teresa
1. 

Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
A. chemical properties
B. physical properties
C. degree of turbulence
D. interfacial area
2. 

In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
A. 0.50B. 0.60
C. 2D. 1
3. 

Fenske equation determines the
A. maximum number of ideal plates.
B. height of the distillation column.
C. minimum number of theoretical plates.
D. optimum reflux ratio.
4. 

The term "cooling range" in a cooling tower refers to the difference in the temperature of
A. cold water leaving the tower and the wet bulb temperature of the surrounding air.
B. hot water entering the tower and the wet bulb temperature of the surrounding air.
C. hot water entering the tower and the cooled water leaving the tower.
D. none of these
5. 

Which of the following is the most suitable for extraction in a system having very low density difference ?
A. Mixer-settler extractor
B. Centrifugal extractor
C. Pulsed extractor
D. Packed extraction tower

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