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Question 1. The ideal air standard Brayton cycle and the ideal Rankine cycle consist of two constant pressure processes alternated with two isentropic processes. Yet, the corresponding the T-S diagrams look much different? Explain? Question 2. For a power cycle, draw T-s diagrams for (a) the Rankine cycle, (b) the ideal Rankine cycle with superheat, (C) the ideal supercritical Rankine cycle (d) the Rankine cycle with reheat. Which of the following power cycles will have the greatest efficiency when working between the same temperatures? Question 3 Gas refrigeration cycles tend to be less efficient than vapor-compression refrigeration cycles, but they do have certain advantages in niche applications such as mobile air-conditioning in transportation carriers. Explain this statement from a material as well as thermodynamic perspective Question 4 Brayton cycles are preferred for aircraft systems but not for cars or trains. Why?