A thermodynamic cycle is shown on a V - T diagram.

The P - V diagram that best describe this cycle is : (Diagrams are schematic and not to scale)
Option: 1 
Option: 2 
Option: 3 
Option: 4 
Since xy is passing through the origin.
So,
So for an ideal gas: P= constant
Now Y-Z is a constant volume graph (from the question). Since Z-X is a constant temperature graph it is hyperbolic in nature. So option 1 is correct
So the correct option is 2.
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