Mass Transfer – Multiple Choice Questions (MCQs)

1. 13. What is distillation?

   • A. Separation of components of a liquid mixture based on differences in boiling points
   • B. Separation of solids from liquids
   • C. Separation of gases from liquids by absorption
   • D. Separation of liquids by filtration

2. 14. What is extraction?

   • A. Separation of components from a mixture by contact with an immiscible solvent
   • B. Separation by boiling point differences
   • C. Separation by density differences
   • D. Separation by filtration

3. 15. What is liquid-liquid extraction?

   • A. Extraction where both phases are liquid
   • B. Extraction where one phase is solid
   • C. Extraction where one phase is gas
   • D. Extraction using a membrane

4. 16. What is adsorption?

   • A. Removal of a component from a fluid by its adherence to a solid surface
   • B. Removal of a component by dissolving it in a liquid
   • C. Separation by boiling
   • D. Separation by filtration

5. 17. What is desorption?

   • A. Release of an adsorbed component from a solid surface
   • B. Adherence of a component to a solid surface
   • C. Dissolving a component in a liquid
   • D. Separating components by distillation

6. 18. Which equipment is commonly used for adsorption?

   • A. Distillation column
   • B. Adsorption bed
   • C. Heat exchanger
   • D. Evaporator

7. 19. What is drying?

   • A. Removal of liquid (usually water) from a solid by evaporation
   • B. Removal of solids from liquids
   • C. Separation of gases
   • D. Heating a solid

8. 20. What is humidification?

   • A. Adding water vapor to a gas stream
   • B. Removing water vapor from a gas stream
   • C. Heating a gas stream
   • D. Cooling a gas stream

9. 21. What is dehumidification?

   • A. Adding water vapor to a gas stream
   • B. Removing water vapor from a gas stream
   • C. Heating a gas stream
   • D. Cooling a gas stream

10. 22. What is crystallization?

    • A. Formation of solid crystals from a solution or melt
    • B. Evaporation of a liquid
    • C. Melting of a solid
    • D. Separation of two immiscible liquids

11. 23. What is membrane separation?

    • A. Separation of components using a semi-permeable membrane
    • B. Separation by distillation
    • C. Separation by extraction
    • D. Separation by adsorption

12. 24. Which of the following is a membrane separation process?

    • A. Reverse osmosis
    • B. Distillation
    • C. Absorption
    • D. Drying