Which outcome occurs when a Stirling engine operates with an imperfect regenerator regarding its thermal mass?

💡 Explanation

When an imperfect regenerator provides insufficient thermal mass, incomplete heat transfer occurs during gas displacement because less heat is stored and released. This leads to a reduced temperature difference between the hot and cold ends diminishing engine efficiency. Therefore reduced temperature difference is the answer, rather than speed increases or consumption decreases, effects which require improved regeneration.

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