Which effect limits maximum efficiency during a combined Brayton-Rankine cycle power plant's operation?

💡 Explanation

When exhaust heat isn't effectively transferred between cycles, heat is lost because combined cycle efficiency relies on Brayton exhaust powering Rankine, leading to wastage. Therefore, Brayton exhaust heat wastage limits efficiency, rather than Rankine subcooling, turbine erosion, or compressor surge which are manageable process constraints.

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