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Thermodynamics: Second Law of Thermodynamics
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Thermodynamics: Second Law of Thermodynamics
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25 Questions

1. Which of the following statement is true?
2. Which of the following is true?
3. A reversible cycle has following processes.
4. For a reversible heat transfer and process being adiabatic, which of the following is true?
5. In a cryogenic experiment you need to keep a container at -125°C although it gains 100 W due to heat transfer. What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20°C?
6. For quasi-static, adiabatic path
7. Efficiency of a heat engine is defined as
8. If the heat pump under these conditions has a COP of 2.5, determine the rate at which heat is absorbed from the cold outdoor air.
9. The function of a heat engine cycle is to _____ continuously at the expense of _____ to the system.
10. A Carnot cycle has following processes.
11. What does a refrigerant do?
12. In a heat pump, there is heat leakage from the body to the surroundings.
13. Coefficient of performance(COP) is defined as
14. Boiler, turbine, condenser and pump together constitute a heat engine.
15. Specific entropy is given by( where m is the mass)
16. For adiabatic, reversible transition,
17. Processes inside a thermal energy reservoir are quasi-static.
18. Which device maintains a body at a temperature higher than the temperature of the surroundings?
19. A cyclic machine, as shown below, receives 325 kJ from a 1000 K energy reservoir. It rejects 125 kJ to a 400 K energy reservoir and the cycle produces 200kJ of work as output. Is this cycle reversible, irreversible, or impossible?
20. Net work in a Carnot cycle is given by (T1=temperature of heat addition and T2=temperature of heat rejection)
21. Integral of dQ/T is independent of reversible path connecting between two points.
22. Which device maintains a body at a temperature higher than the temperature of the surroundings?
23. What is the relation between COP of heat pump and refrigerator?
24. A reversible adiabatic process is an isentropic process.
25. If the heat pump under these conditions has a COP of 2.5, determine the power consumed by the heat pump.

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