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← ScienceWhich risk escalates when a turbine engine's bypass ratio decreases?
A)Compressor stall margin improves significantly.
B)Combustion instability is suppressed greatly.
C)Thermal stress increases on turbine blades.✓
D)Propulsive efficiency becomes relatively heightened.
💡 Explanation
Decreasing an engine's bypass ratio shifts more energy through the core; this intensifies the temperature experienced by turbine blades via elevated heat transfer. Therefore thermal stress increases, rather than improvements to combustion or compressor stall, because primary airflow is hotter.
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