Heat Transfer MCQs

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1. Which mode of heat transfer does not require a medium to propagate?





2. In which mode of heat transfer does heat transfer occur due to the movement of fluid particles?





3. What is the process of heat transfer through direct contact between molecules called?





4. Which material typically exhibits the highest thermal conductivity?





5. Which law of thermodynamics states that heat always flows from a higher temperature object to a lower temperature object?





6. Which type of heat exchanger involves two fluids flowing in opposite directions?





7. What is the SI unit of thermal conductivity?





8. Which property of a material determines how much heat it can store per unit mass per degree change in temperature?





9. What is the term for the process of reducing heat transfer by trapping air in a material?





10. Which phenomenon explains why metals feel cold to touch at room temperature?





11. Which mode of heat transfer involves the transfer of energy by electromagnetic waves?





12. Which type of material is an effective thermal insulator?





13. What is the process by which heat is transferred within a solid material without any movement of the material itself?





14. Which law states that the rate of heat transfer through a material is proportional to the temperature difference across the material and inversely proportional to the thickness?





15. What is the term for the total heat transfer per unit area per unit time by convection from a surface to the fluid?





16. Which factor affects the rate of convective heat transfer between a solid surface and a fluid?





17. Which law of thermodynamics states that energy cannot be created or destroyed, only transformed or transferred?





18. What does the term ’emissivity’ refer to in radiation heat transfer?





19. Which law of radiation states that the radiant energy emitted by a perfect blackbody is proportional to the fourth power of its absolute temperature?





20. Which type of heat exchanger involves fluids flowing at right angles to each other?





21. Which material property affects the rate of radiative heat transfer?





22. What is the term for the rate of heat transfer through a unit area of a material for a given temperature difference?





23. Which type of heat transfer involves the movement of energy due to the movement of fluid particles?





24. Which law of radiation states that for every absorbing surface, there is an equivalent amount of emitting surface?





25. What is the term for the process by which heat is transferred by the circulation or movement of a fluid?





26. Which material property indicates how quickly heat can travel through a material?





27. Which law states that the direction of heat transfer is from higher temperature to lower temperature?





28. Which type of heat exchanger involves fluids flowing in the same direction?





29. What is the term for the ability of a material to emit radiation?





30. What is the term for the process by which electromagnetic waves travel through space and transfer heat?





 

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