Question

Which one of the following entropy (S) - temperature (T) diagrams CORRECTLY represents the Carnot cycle abcda shown in the P-V diagram? 

• A.
• B.
• C.
• D.

Hint:

For a Carnot cycle, isothermal processes are straight horizontal lines in the entropy-temperature diagram, while adiabatic processes are curved.

Answer 1

The Correct Option is D

- In the Carnot cycle, the entropy (S) - temperature (T) diagram involves two isothermal processes and two adiabatic processes.
- The isothermal processes occur at constant temperature (i.e., straight lines in the S-T diagram).
- The adiabatic processes, on the other hand, involve changes in both temperature and entropy. These are typically represented as curved lines in the S-T diagram.
- Option (D) correctly represents these features with isothermal lines at constant temperatures and adiabatic processes as curved lines.
Thus, the correct answer is (D).