Heat Transfer MCQs

Q1. Which one of the following is NOT a mode of heat transfer?

Q2. Fourier’s law is associated with which mode of heat transfer?

Q3. Newton’s law of cooling pertains to which heat transfer mode?

Q4. What is the unit of thermal conductivity?

Q5. The emissivity of a perfect black body is:

Q6. Convective heat transfer depends on:

Q7. What is the effect of adding insulation to a wall on heat transfer?

Q8. In radiation heat transfer, energy is transferred by:

Q9. The Stefan-Boltzmann law is used in:

Q10. Biot number in heat transfer is the ratio of:

Q11. In steady-state conduction, temperature varies with:

Q12. Which of the following affects convective heat transfer coefficient?

Q13. Nusselt number is a dimensionless number related to:

Q14. In a heat exchanger, which fluid has higher temperature at the outlet in counterflow arrangement?

Q15. The thermal boundary layer thickness decreases with:

Q16. Critical thickness of insulation is:

Q17. Radiation heat transfer does not require:

Q18. In natural convection, fluid motion is caused by:

Q19. Fouling factor in heat exchanger refers to:

Q20. Thermal radiation intensity depends on:

Q21. Condensation in heat transfer is:

Q22. In forced convection, fluid motion is:

Q23. Heat transfer rate in conduction is proportional to:

Q24. In the lumped system analysis, Biot number should be:

Q25. The overall heat transfer coefficient depends on:

Q26. Which law states emissivity equals absorptivity in thermal radiation?

Q27. Radiation heat transfer is maximum between:

Q28. Which dimensionless number relates momentum and heat transfer?

Q29. Film coefficient in heat transfer refers to:

Q30. Which factor affects radiation heat transfer?

Q31. Laminar flow heat transfer is:

Q32. Which heat transfer mode involves molecular collision?

Q33. Heat exchangers are used to:

Q34. Thermal conductivity of insulation materials is:

Q35. In convection, heat transfer rate increases with:

Q36. Radiation heat can travel through:

Q37. Which type of fins have constant cross-sectional area?

Q38. The emissivity of a perfect reflector is:

Q39. Nusselt number greater than 1000 indicates:

Q40. Overall heat transfer coefficient is measured in: