Question 71 : Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the
1. multicomponent distillation is involved.
2. mixture (to be separated) shows positive deviation from ideality.
3. relative volatility is reasonably constant.
4. mixture (to be separated) shows negative deviation from ideality.
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Question 72 : The term ''cooling range'' in a cooling tower refers to the difference in the temperature of
1. hot water entering the tower and the cooled water leaving the tower.
2. cold water leaving the tower and the wet bulb temperature of the surrounding air.
3. none of these
4. hot water entering the tower and the wet bulb temperature of the surrounding air.
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Question 73 : Which of the following is the most suitable for extraction in a system having very low density difference ?
1. Mixer-settler extractor
2. Centrifugal extractor
3. Packed extraction tower
4. Pulsed extractor
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Question 74 : Total reflux in a distillation operation requires minimum
1. reboiler load
2. number of plates
3. condenser load
4. All of above
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Question 75 : In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is
1. 0.5
2. 1
3. 2
4. 0.6
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Question 76 : Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
1. physical properties
2. interfacial area
3. degree of turbulence
4. chemical properties
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Question 77 : Fenske equation determines the
1. minimum number of theoretical plates.
2. maximum number of ideal plates.
3. height of the distillation column.
4. optimum reflux ratio.
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