The given figure shows the P-V diagram of Otto cycle. Which of the following is true for this cycle?
1
Process 3 - 4 is a reversible isothermal expansion.
2
Process 1 - 2 is an isentropic compression process.
3
Both the processes 1 - 2 and 3 - 4 are isentropic compression processes.
4
Process 1 - 2 is a reversible isothermal compression.