Question
A heat engine executes one complete cycle. The change in entropy of the engine (just the engine, not the external thermal reservoirs) is:
Answer: Option A
:
A
In one complete cycle, the engine returns to its original state. So all macroscopic variables (N, V, T, S etc) must return to their original state and the change is zero. Remember, even though heat is a path variable, the entropy S is a state variable, hence this stamen will be true even for an irreversible process.
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:
A
In one complete cycle, the engine returns to its original state. So all macroscopic variables (N, V, T, S etc) must return to their original state and the change is zero. Remember, even though heat is a path variable, the entropy S is a state variable, hence this stamen will be true even for an irreversible process.
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