An ideal gas is subjected to a cyclic process $\mathrm{ABCD}$ as depicted in the $\mathrm{p}-\mathrm{V}$ diagram given below:
Which of the following curves represents the equivalent cyclic process?

• Correct answer
  A

  
• B

  
• C

  
• D

  

Solution

Process $A \rightarrow B \rightarrow C \rightarrow D \rightarrow A$ is clockwise. During $A \rightarrow B$, pressure is constant and $B \rightarrow C$, process follows $p \propto \frac{1}{V}$ ie., $T$ is constant. During process $C \rightarrow D$, both $p$ and $V$ changes and process $D \rightarrow A$ follows $p \propto \frac{1}{V}$ i.e., $T$ is constant.
Hence, equivalent cyclic process is has follows.

Hence, the correct answer is option: 'A'.