A closed system undergoes a cycle consisting of two processes. Process 1 - 2 is an isothermal expansion whereas Process 2 - 1 is an isentropic compression. According to the first law of thermodynamics, which of the following statements is true for this cycle?
1
Heat transfer during Process 1 - 2 is zero.
2
Heat transfer during Process 2 - 1 is zero.
3
Work done during Process 1 - 2 is zero.
4
Work done during Process 2 - 1 is zero.