Mass Transfer MCQs Archives

491. 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.

492. 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.

493. Ordinary diffusion process is also called __________ diffusion.

Pressure

Thermal

Concentration

Forced

✅ The correct answer is option C.

494. 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.

495. 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.

496. 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.

497. 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.

498. Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.

Rotary

Tray

Freeze

None of these

✅ The correct answer is option B.

499. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Molal

Relative

Percentage

None of these

✅ The correct answer is option A.

500. Molality is defined as the number of gm moles of solute per __________ of solvent.

Litre

m³

✅ The correct answer is option C.