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A thermodynamic cycle in the pressure (P...

A thermodynamic cycle in the pressure (P) - volume (V) plane is given below :

AB and CD are isothermal processes while BC and DA are adiabatic processes. The same cycle in the temperature (T) - entropy (S) plane is :

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
A
AB is isothermal reversible expansion process i.e. `Delta`T = 0 and S increases as there is increase in volume.
BC is adiabatic reversible expansion process
`(q_("rev")=0)` i.e., temperature decreases and `DeltaS=0`.
CD is isothermal reversible compression process i.e. `DeltaT = 0` and S decreases as there is decrease in volume.
DA is adiabatic reversible compression process `(q_("rev") = 0)` i.e. temperature decreases and `DeltaS = 0. `
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