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← ScienceWhich risk increases when a Stirling engine's cycle operates near isothermal conditions during compression?
A)Increased regenerator flow impedance
B)Elevated mechanical stress on piston
C)Reduced net indicated work output✓
D)Thermal runaway near working fluid
💡 Explanation
Reduced isothermal compression means less heat rejection. Because Stirling engine efficiency increases with decreasing heat rejection via the Carnot cycle, therefore work output drops, rather than improved cooling with better isothermal conditions which is the usual operational target.
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