Reversibility and Carnot cycle

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The Carnot cycle is designed to be completely reversible, adhering to the principles of thermodynamics. In a reversible process, the change in entropy (ΔS) is indeed zero, as the system's entropy can change only if the surroundings compensate accordingly. This aligns with the Clausius theorem, which states that for a reversible cycle, the total entropy of the universe remains constant. Thus, the Carnot cycle exemplifies the ideal conditions for reversibility in thermodynamic processes. Understanding these concepts is crucial for grasping the fundamentals of thermodynamics.
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I have two short questions:

1) Is the Carnot cycle completely reversible?

2) \Delta S = 0 for a reversible process, right?
 
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Yes, the Carnot cycle is designed as being reversible.

Yes, it is the Clausius theorem for a reversible cycle. On a particular reversible process, a system can increase o decrease its entropy provided that the surroundings decrease or increase it by the same amount, as the universe entropy will remain constant.
 

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