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

1. 193. What is 'thermal expansion'?

   • A. The tendency of matter to change in volume in response to a change in temperature
   • B. The tendency of matter to change phase
   • C. The tendency of matter to conduct heat
   • D. The tendency of matter to resist heat flow

2. 194. What is 'thermal stress'?

   • A. Stress caused by temperature changes
   • B. Stress caused by external forces
   • C. Stress caused by fluid flow
   • D. Stress caused by chemical reactions

3. 195. What is the 'heat generation rate' for a volumetric heat source?

   • A. q''' (heat generated per unit volume)
   • B. Q (total heat generated)
   • C. q'' (heat flux)
   • D. k (thermal conductivity)

4. 196. What is 'heat pipe'?

   • A. A heat transfer device that uses phase change (evaporation and condensation) to transfer heat with very high effective thermal conductivity
   • B. A device for insulation
   • C. A device for mixing fluids
   • D. A device for generating heat

5. 197. What is 'thermal shock'?

   • A. Damage caused by rapid temperature changes
   • B. Damage caused by overheating
   • C. Damage caused by undercooling
   • D. Damage caused by chemical reactions

6. 198. What is 'quenching' process typically used for in metallurgy?

   • A. Rapid cooling to harden a material
   • B. Slow cooling to soften a material
   • C. Heating a material to high temperatures
   • D. Shaping a material

7. 199. What is a 'furnace' in chemical engineering?

   • A. An enclosed structure where materials are heated to very high temperatures
   • B. A device for cooling fluids
   • C. A device for mixing chemicals
   • D. A device for separating components

8. 200. What is 'radiation intensity'?

   • A. The rate at which radiation is emitted from a surface per unit area and per unit solid angle
   • B. The total energy emitted by radiation
   • C. The wavelength of radiation
   • D. The frequency of radiation

9. 201. What is 'absorber' in solar energy applications?

   • A. A surface or material designed to maximize the absorption of solar radiation
   • B. A device that reflects solar radiation
   • C. A device that transmits solar radiation
   • D. A device that generates electricity from solar energy

10. 202. What is 'collector' in solar energy applications?

    • A. A device that collects solar radiation and converts it into useful heat or electricity
    • B. A device that absorbs all solar radiation
    • C. A device that reflects solar radiation
    • D. A device that stores solar energy

11. 203. What is the primary heat transfer mechanism in a domestic oven?

    • A. Convection and radiation
    • B. Conduction only
    • C. Radiation only
    • D. Convection only

12. 204. What is 'latent heat'?

    • A. Heat associated with a change in temperature without a phase change
    • B. Heat associated with a phase change at constant temperature
    • C. Heat transferred by conduction
    • D. Heat transferred by radiation