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Thermodynamics Practice Test: Entropy
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Entropy topics include: Entropy property, temperature entropy, entropy applications and mechanisms, entropy generations, first and second laws, reversible adiabatic work. In thermodynamics, entropy is a quantitative measure of the disorder or randomness in a system. It's also known as a thermodynamic function, which is a thermodynamic quantity whose change is independent of the system's path.  Entropy is central to the second law of thermodynamics, which states that the entropy of an isolated system cannot decrease with time. This means that isolated systems evolve toward thermodynamic... Show more
Thermodynamics Practice Test: Entropy
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25 Questions

1. Any thermodynamic process is accompanied by entropy generation.
2. For the flow of electric current through a resistor,
3. A hot metal piece is cooled rapidly to 25°C, removing 1000 kJ from the metal. Calculate the change of entropy if saturated liquid R-22 at −20°C absorbs the energy so that it becomes saturated vapor.
4. The first law of thermodynamics makes no distinction between heat transfer and work.
5. The equation dQ=dU+pdV holds good for
6. The entropy of an isolated system can never ____
7. Which of the following equation is true?
8. A hot metal piece is cooled rapidly to 25°C, removing 1000 kJ from the metal. Calculate the change of entropy if energy is absorbed by vaporizing liquid nitrogen at 101.3 kPa pressure.
9. Lost work is given by
10. The equation TdS=dH-Vdp
11. Entropy increase dS of the system can be expressed as
12. When work is dissipated into internal energy, what is the change in the disorderly motion of molecules.
13. Oxygen gas in a piston cylinder at 300 K, 100 kPa with volume 0.1m^3 is compressed in a reversible adiabatic process to a final temperature of 700 K. Find the final pressure and volume.
14. The equation dQ=dE+dW holds good for
15. Which of the following processes exhibit external mechanical irreversibility?
16. The entropy of any closed system can increase in which if the following way?
17. Which of the following explains that there is no entropy transfer associated with work.
18. The equation TdS=dU+pdV is obtained from which law?
19. For adiabatic, reversible transition,
20. Which of the following is true?
21. Which of the following can be considered as an application of entropy principle?
22. For the general case, we can write
23. A hot metal piece is cooled rapidly to 25°C, removing 1000 kJ from the metal. Calculate the change of entropy if energy is absorbed by ice.
24. For two different paths between same two points, entropy change is
25. Net work in a Carnot cycle is given by (T1=temperature of heat addition and T2=temperature of heat rejection)