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.Management Sciences
Category: Mass Transfer
Pick out the wrong statement ?
A. Cellulose acetate membranes are used in dialysis process
B. Elutriation process refers to when the soluble material is largely concentrated on the surface of
an insoluble solid and is simply washed off by the solvent
C. ‘Cascade’ means a group of stages interconnected so that various streams flow from one to
another
D. Zirconia probe is used for the humidity measurement
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as___________________?
A. Re0.33
B. Re0.53
C. Re0.83
D. Re
Which of the following is an undesirable property in a tower packing ?
A. Large surface per unit volume
B. Large free cross-section
C. Low weight per unit volume
D. Large weight of liquid retained
Priming in a distillation column_________________?
A. Results from very low gas velocity
B. Is desirable from point efficiency consideration
C. Is characterised by the presence of foam throughout the space between trays
D. Reduces the overall pressure drop
Solvent used in extractive distillation_________________________?
A. Is of low volatility
B. Forms a low boiling azeotrope
C. Forms a high boiling azeotrope
D. Does not alter the relative volatility of the original components
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and _________________?
A. Humidified with wet bulb temperature decreasing
B. Humidified at constant wet bulb temperature
C. Dehumidified
D. None of these
Total reflux in a distillation operation requires minimum____________________?
A. Reboiler load
B. Number of plates
C. Condenser load
D. All A., B. and C.
In Azeotropic mixture, the equilibrium vapour composition is____________________?
A. More than liquid composition
B. Less than liquid composition
C. Same as liquid composition
D. Independent of pressure
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