Which outcome occurs when friction increases in a Stirling engine's displacer mechanism causing decreased thermal cycling efficiency?

💡 Explanation

When friction increases, less of the heat engine's ideal thermal cycling goes into piston movement because energy is dissipated into frictional heat. This reduces overall the engine's efficiency, thereby reducing actual power output. Therefore, reduced net power will be the most likely result, compared with leakage, increased regenerator temp or cylinder head failure which while possible, depend on independent factors occurring.

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