Question 21 : Plate efficiency
1. is a function of the mass transfer between liquid and vapour.
2. increases due to foaming.
3. increases due to weeping and dumping of liquid.
4. increases due to liquid entrainment.
View Answer   Discuss with Members

Question 22 : In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)
1. remains unchanged
2. decreases
3. none of these
4. increases
View Answer   Discuss with Members

Question 23 : For a single component absorber, the operating line is straight only when plotted in term of __________ units.
1. mole ratio
2. partial pressure
3. mole fraction
4. none of these
View Answer   Discuss with Members

Question 24 : Flooding in a distillation column is detected by a sharp
1. decrease in liquid hold up in the coloumn.
2. increase in Murphree plate efficiency.
3. decrease in pressure drop.
4. increase in pressure drop.
View Answer   Discuss with Members

Question 25 : Minimum reflux ratio in a distillation column results in
1. maximum condenser size.
2. minimum reboiler size.
3. optimum number of trays.
4. minimum number of trays.
View Answer   Discuss with Members

Question 26 : In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
1. either lower than or higher than, depends on the mixture composition
2. equal to
3. lower than
4. higher than
View Answer   Discuss with Members

Question 27 : For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams
1. increases
2. decreases
3. remains unaffected
4. passes through a maximum
View Answer   Discuss with Members

Question 28 : At constant pressure, with increase of temperature, the dew point will
1. increase
2. decrease
3. remain unchanged
4. increase/decrease ; depends on the temperature
View Answer   Discuss with Members

Question 29 : A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is
1. 0.54
2. 24
3. 4
4. 94
View Answer   Discuss with Members

Question 30 : In rectifying section of a continuous distillation column, the
1. none of these.
2. vapour is enriched with low boilers.
3. vapour is enriched with high boilers.
4. liquid is stripped of high boilers.
View Answer   Discuss with Members