02Thermodynamics Interview Questions for PSUs

1. What is thermal engineering?
• Thermal engineering is a branch of engineering that deals with the study of heat transfer, thermodynamics, and energy conversion.
2. What is the first law of thermodynamics?
• The first law of thermodynamics is the law of conservation of energy, which states that energy cannot be created or destroyed, only transferred or converted from one form to another.
3. What is the second law of thermodynamics?
• The second law of thermodynamics states that the total entropy of a closed system always increases over time.
4. What is entropy?
• Entropy is a measure of the disorder or randomness of a system.
5. What is heat transfer?
• Heat transfer is the process of transferring thermal energy from one object or system to another.
6. What are the three modes of heat transfer?
• The three modes of heat transfer are conduction, convection, and radiation.
7. What is conduction?
• Conduction is the transfer of heat through a material without any movement of the material itself.
8. What is convection?
• Convection is the transfer of heat through the movement of a fluid, such as air or water.
9. What is radiation?
• Radiation is the transfer of heat through electromagnetic waves, such as light or infrared radiation.
10. What is a heat exchanger?
• A heat exchanger is a device that transfers heat from one fluid to another without the fluids coming into direct contact.
11. What is a refrigerant?
• A refrigerant is a substance that is used in a refrigeration cycle to transfer heat from one place to another.
12. What is a compressor?
• A compressor is a device that compresses a gas, such as a refrigerant, to increase its temperature and pressure.
13. What is a condenser?
• A condenser is a device that removes heat from a gas, such as a refrigerant, and converts it back into a liquid.
14. What is an evaporator?
• An evaporator is a device that absorbs heat from a liquid, such as a refrigerant, and converts it into a gas.
15. What is a Rankine cycle?
• A Rankine cycle is a thermodynamic cycle that is used in steam power plants to generate electricity.
16. What is a Carnot cycle?
• A Carnot cycle is a theoretical thermodynamic cycle that is used to determine the maximum efficiency of a heat engine.
17. What is a heat engine?
• A heat engine is a device that converts thermal energy into mechanical energy.
18. What is a heat pump?
• A heat pump is a device that transfers heat from a lower temperature source to a higher temperature sink.
19. What is thermal conductivity?
• Thermal conductivity is a measure of a material's ability to conduct heat.
20. What is thermal resistance?
• Thermal resistance is a measure of a material's ability to resist the flow of heat.

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