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Which limit is reached as geothermal steam flashes?

A)Maximum work due to phase transitions
B)Minimum heat rejected into condensation
C)Isentropic efficiency approaches equilibrium
D)Temperature stabilizes within system volume

💡 Explanation

As reservoir pressure drops driving geothermal steam turbines, adiabatic expansion approaches equilibrium with reduced energy available; therefore isentropic efficiency decreases because the reversible process assumption becomes less accurate, rather than maximum work being achieved.

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