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- 4. Which of the following statements does not correctly represent the second law of thermodynamics? a. Perpetual motion machines do not exist. b. Heat flows spontaneously from high temperature regions to low temperature regions. c. The entropy of the universe tends to decrease. d. Heat cannot be converted to work with 100% efficiency. e. Transporting heat from low temperature regions to high temperature regions requires the application of external work.5. A system consists of a two-phase liquid-vapor mixture of 5 kg of R-134a. One kg is saturated liquid. What is the quality? 6. Given the temperature and specific volume of a two-phase liquid-vapor mixture, how would you determine the specific internal energy? 24. The first law of thermodynamics states that a. components of a system interact. b. entropy of a closed system always increases. c. closed system always shifts toward disorder or homogeneity. d. Energy is always conserved. 5. According to the second law of thermodynamics, the heat received from a high temperature reservoir by a heat engine operating in a complete cycle a. must be completely converted to work. b. equals the entropy increase. C. converted completely into internal energy. d. cannot be completely converted to work.
- 6. According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process: A. equals the heat input minus the work done on the gas 1 B. equals the heat input plus the work done on the gas C. equals the work done on the gas minus the heat input D. is independent of the heat input E. is independent of the work done on the gas11-