X/(X + 1)
X/(X – 1)
(X + 1)/X
(X – 1)/X
✅ The correct answer is option A.
Mass Transfer MCQs
Absorption factor method is used to calculate the number of ideal stages, when
Operating line lies above the equilibrium line
Operating line lies below the equilibrium line
Both operating and equilibrium lines are parallel
Pressure drop in the column is very high
✅ The correct answer is option C.
Only small amount of evaporation of water produces large cooling effects because of its
Large latent heat
Low viscosity
Small latent heat
None of these
✅ The correct answer is option A.
Ordinary diffusion process is also called __________ diffusion.
Pressure
Thermal
Concentration
Forced
✅ The correct answer is option C.
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.
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.
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.
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.
The Hatta number is important in
Multicomponent distillation
Binary distillation
Gas absorption without chemical reaction
Gas absorption with chemical reaction
✅ The correct answer is option D.