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

1. 73. In Fourier's Law, what does 'k' represent?

   • A. Heat transfer coefficient
   • B. Thermal conductivity
   • C. Specific heat capacity
   • D. Heat flux

2. 74. What is the unit of thermal conductivity (k) in SI units?

   • A. W/(m·K)
   • B. J/(kg·K)
   • C. W/(m²·K)
   • D. W/m²

3. 75. What does a high thermal conductivity indicate?

   • A. Good insulator
   • B. Poor heat conductor
   • C. Good heat conductor
   • D. High specific heat

4. 76. Which law describes the rate of heat transfer by convection?

   • A. Newton's Law of Cooling
   • B. Fourier's Law of Heat Conduction
   • C. Stefan-Boltzmann Law
   • D. Fick's Law of Diffusion

5. 77. In Newton's Law of Cooling, what does 'h' represent?

   • A. Thermal conductivity
   • B. Heat transfer coefficient
   • C. Specific heat capacity
   • D. Heat flux

6. 78. What is the unit of heat transfer coefficient (h) in SI units?

   • A. W/(m·K)
   • B. J/(kg·K)
   • C. W/(m²·K)
   • D. W/m²

7. 79. Which law describes the rate of heat transfer by radiation?

   • A. Newton's Law of Cooling
   • B. Fourier's Law of Heat Conduction
   • C. Stefan-Boltzmann Law
   • D. Fick's Law of Diffusion

8. 80. What is the Stefan-Boltzmann constant (σ)?

   • A. A value related to heat capacity
   • B. A fundamental constant in radiation heat transfer
   • C. A measure of thermal conductivity
   • D. A constant in fluid flow equations

9. 81. 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

10. 82. 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

11. 83. 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

12. 84. 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