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← ScienceWhich inefficiency increases when a real Carnot engine increases cycle rate?
A)Irreversible heat transfer dominates isobars✓
B)Turbulence increases in adiabatic stages
C)Friction dominates the PV diagram
D)Adiabatic expansion becomes nearly isothermal
💡 Explanation
Irreversible heat transfer causes inefficiencies because temperature gradients form within the working fluid during rapid changes, therefore the efficiency decreases rapidly rather than maintaining Carnot efficiency, and isobars are never sharp lines unlike adiabatic curves.
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