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← ScienceWhich performance limit occurs for cascaded Carnot engines?
A)Combined efficiency always decreases✓
B)Exhaust reverses energy direction
C)Coolant flow path instability
D)First engine overheating exceeds threshold
💡 Explanation
The overall efficiency of cascaded Carnot engines is always lessened by losses; because each stage's efficiency multiplies, the total is lower than optimal, therefore the combined efficiency decreases, rather than a flow problem or individual overheating influencing limits.
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