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.Management Sciences
Category: Mass Transfer
In case of binary distillation, increasing the reflux ratio above optimum does not result in the increase of_______________________?
A. Area between operating line and 45° diagonal x-y diagram
B. Condenser and reboiler surfaces
C. Tower cross-section
D. None of these
Make up water is required in a cooling tower to replace the water lost by___________________?
A. Evaporation
B. Drift
C. Blowdown and leakage
D. All A., B. and C.
Which of the following is a suitable absorbent for removal of H2S from natural gas ?
A. Vetrocoke solution
B. Monoethanolamine (MEA)
C. Dilute
D. Hot water
Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
A. log P vs. T
B. log P vs. log T
C. T vs. P
D. P vs. log T
As per Gilliland’s equation, the diffusivity is___________________?
A. Directly proportional to ‘T1.5’
B. Inversely proportional to ‘P’
C. Dependent on the molecular volume & molecular weight of components
D. All A , B. & C.
Pick out the wrong statement ?
A. In solvent extraction, the distribution co-efficient should be as large as possible for solvent
economy
B. With increase in pressure, the solubility of gases in solvent increases at a fixed temperature
C. Decrease in Murphree plate efficiency is an indication of entrainment in distillation column
D. The capacity of a distillation column is maximum at total reflux
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for_________________?
A. Constant molal overflow
B. Total reflux
C. Constant relative volatility
D. All A., B. and C.
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be _______________ percent?
A. 100
B. > 100
C. < 100
D. None of these
Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _______________ the liquid head available in the downcomer?
A. Less than
B. More than
C. Same as
D. Very much less
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