Question 11 : Use of packed towers for distillation is generally limited to the
1. small sizes.
2. high pressure operation.
3. multicomponent distillation.
4. vacuum distillation.
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Question 12 : The minimum liquid rate to be used in an absorber corresponds to an operating line
1. ofslope = 0.1
2. of slope = 1
3. tangential to the equilibrium curve
4. none of these
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Question 13 : Laboratory determination of the dif-fusivity of vapor is done by __________ method.
1. Gilliland's
2. Winkel mann's
3. wetted wall column
4. Wike's
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Question 14 : For a distillation column operating at minimum reflux, the
1. reflux ratio will be maximum.
2. concentration of liquid and vapour leaving a plate will be same.
3. number of plates required will be maximum.
4. none of these.
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Question 15 : Leaching rate is independent of the
1. none of these
2. particle size
3. agitation
4. temperature
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Question 16 : Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
1. high evaporation losses of water.
2. high pressure drop of the gas.
3. difficulty in its fabrication.
4. none of these.
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Question 17 : Flash distillation is suitable for the separation of components
1. having very wide boiling points.
2. which form minimum boiling azeotrope.
3. having very close boiling points.
4. which form maximum boiling azeotrope.
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Question 18 : In Mcabe-Thiele method, at infinite reflux ratio
1. none of these.
2. number of plates is maximum.
3. overhead product is maximum.
4. both the operating lines coincide with the diagram.
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Question 19 : Absorption accompanied by heat evolution results in
1. decrease in equilibrium solubility.
2. increase in equilibrium solubility.
3. increased capacity of the absorber.
4. none of these.
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Question 20 : For a binary mixture with low relative volatility,
1. an azeotrope may be formed during distillation.
2. use molecular distillation.
3. use high pressure distillation.
4. use steam distillation.
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