7211. With increase in pressure, the relative volatility for a binary system
Increases
Decreases
Remains same
Either A or B, depends on the system
✅ The correct answer is option B.
Chemical Engineering
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7212. Channelling is most severe
In towers packed with stacked packing
In towers packed randomly with crushed solids
In dumped packing of regular units
At very high liquid flow rate
✅ The correct answer is option A.
7213. During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
Wet bulb temperature
Partial pressure of water vapor
Relative humidity
None of these
✅ The correct answer is option A.
7214. 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
0.54
1.04
1.24
1.94
✅ The correct answer is option C.
7215. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be
At ground level
2 metres above the ground
5 metres above ground
10 metres above ground
✅ The correct answer is option A.
7216. Extraction of pencillin employs a __________ extraction coloumn.
Centrifugal
Packed
Plate
None of these
✅ The correct answer is option A.
7217. Which of these columns incurs the lowest pressure drop?
Packed column (with stacked packing)
Packed column (with dumped packing)
Bubble plate column
Pulse column
✅ The correct answer is option A.
7218. Stacked packing compared to dumped packing
Provides poorer contact between the fluids
Gives lower pressure drop
Both A & B
Gives higher pressure drop
✅ The correct answer is option C.
7219. Molecular diffusion is caused by the
Transfer of molecules from low concentration to high concentration region
Thermal energy of the molecules
Activation energy of the molecules
Potential energy of the molecules
✅ The correct answer is option B.
7220. Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are
1
8
9
10
✅ The correct answer is option C.