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← ScienceWhich limitation constrains Carnot engine efficiency increase when source temperature is marginally raised?
A)Material strength at higher temperatures✓
B)Reduced heat transfer surface area needs
C)Decreased cycle operational frequency
D)Increased irreversibilities at faster speeds
💡 Explanation
When the source temp rises marginally, the Carnot efficiency formula indicates an increase, however material strength becomes the largest limiting factor as materials become pliable and lose structural integrity at operational temperatures. Therefore, material strength limits efficiency increase, rather than surface area, speed, frequency which all assist rather hinder efficiencies.
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