Heat Transfer (Chemical Perspective) – Multiple Choice Questions (MCQs)

1. 13. What is 'blackbody' in radiation heat transfer?

   • A. An ideal surface that absorbs all incident radiation and emits the maximum possible radiation at a given temperature
   • B. A surface that reflects all radiation
   • C. A surface that transmits all radiation
   • D. A surface with zero emissivity

2. 14. What is 'emissivity' (ε)?

   • A. A measure of a material's ability to absorb radiation
   • B. A measure of a material's ability to reflect radiation
   • C. A measure of a material's ability to emit radiation
   • D. A measure of a material's thermal conductivity

3. 15. What is a 'heat exchanger'?

   • A. A device used to transfer heat between two or more fluids at different temperatures
   • B. A device used for chemical reactions
   • C. A device used for fluid separation
   • D. A device used for mixing

4. 16. What is 'radiation shield'?

   • A. A device used to block heat transfer by conduction
   • B. A device used to block heat transfer by convection
   • C. A low-emissivity material placed between two surfaces to reduce radiative heat transfer
   • D. A device used to enhance heat transfer

5. 17. What is 'insulation'?

   • A. Material used to increase heat transfer
   • B. Material used to reduce heat transfer
   • C. Material used to conduct electricity
   • D. Material used for structural support

6. 18. What is the purpose of 'fins' on heat transfer surfaces?

   • A. To decrease the surface area for heat transfer
   • B. To increase the surface area for heat transfer
   • C. To reduce fluid flow
   • D. To increase pressure drop

7. 19. What is 'natural convection'?

   • A. Fluid movement due to density differences arising from temperature variations
   • B. Fluid movement forced by pumps or fans
   • C. Heat transfer through direct contact
   • D. Heat transfer by electromagnetic waves

8. 20. What is 'boiling heat transfer'?

   • A. Heat transfer during a phase change from liquid to vapor
   • B. Heat transfer during a phase change from solid to liquid
   • C. Heat transfer in solids
   • D. Heat transfer in gases

9. 21. What is 'condensation heat transfer'?

   • A. Heat transfer during a phase change from vapor to liquid
   • B. Heat transfer during a phase change from liquid to vapor
   • C. Heat transfer in solids
   • D. Heat transfer in gases

10. 22. What is 'nucleate boiling'?

    • A. Boiling characterized by the formation and growth of bubbles at nucleation sites on the heating surface
    • B. Boiling without bubble formation
    • C. Boiling on a completely smooth surface
    • D. Boiling that occurs at very low heat fluxes

11. 23. What is a 'reboiler' in a distillation column?

    • A. A heat exchanger that provides heat to vaporize part of the liquid mixture
    • B. A heat exchanger that removes heat to condense vapor
    • C. A device for mixing liquids
    • D. A device for separating solids

12. 24. What is a 'condenser' in a distillation column?

    • A. A heat exchanger that provides heat to vaporize liquid
    • B. A heat exchanger that removes heat to condense vapor
    • C. A device for mixing gases
    • D. A device for separating liquids