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← ScienceWhich outcome occurs when the expansion stage in an irreversible Rankine cycle operates with significant friction?
A)Reduced turbine work output and efficiency✓
B)Increased condenser heat rejection rate
C)Elevated boiler pressure due to backflow
D)Lower pump work requirement for compression
💡 Explanation
When friction occurs during the expansion process, energy is dissipated as heat because viscous forces oppose the piston motion leading to less mechanical work output, reducing cycle efficiency. Therefore, turbine work output and overall thermal efficiency decreases, rather than increasing heat rejection, boiler pressure, or lowering feed pump work.
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