7461. Ordinary diffusion process is also called __________ diffusion.
Pressure
Thermal
Concentration
Forced
✅ The correct answer is option C.
Chemical Engineering
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7462. The rate of solid-liquid extraction is limited by the
Phase change of the solute as it dissolves in the solvent
Diffusion of the solute through the solvent in the pores to the outside of the particle
Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
All of the above
✅ The correct answer is option D.
7463. In an absorber, HETP does not vary with the
Flow rate of liquid
Flow rate of gas
Type and size of packing
None of these
✅ The correct answer is option D.
7464. The term “approach” in a cooling tower refers to the difference in the temperature of the
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
None of these
✅ The correct answer is option A.
7465. Perforated plate towers are unique for solvent extraction because, they provide
Higher contact area
Better contact of the phase
Repeated coalescence & redispersion of the drop phase
None of these
✅ The correct answer is option C.
7466. Which of the following parameters remains constant during chemical dehumidifica-tion?
Dry bulb temperature
Partial pressure of vapour
Wet bulb temperature
None of these
✅ The correct answer is option A.
7467. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
Packed
Bubble
Spray
Tray
✅ The correct answer is option B.
7468. When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.
Always lower than
Always higher than
Same as
Dependent on the system; can be either lower or higher than
✅ The correct answer is option A.
7469. Unit operation involved in the prilling of urea is
Evaporation
Drying
Crystallisation
Both B and C
✅ The correct answer is option D.
7470. __________ is concerned with the adsorption equilibria.
Fick’s law
Gibb’s equation
Freundlich equation
None of these
✅ The correct answer is option C.