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← ScienceWhich risk increases when a jet engine exceeds design RPM?
A)Turbine blade flutter develops rapidly✓
B)Exhaust plume becomes visually opaque
C)Combustion efficiency sharply increases
D)Compressor stalls reverse airflow
💡 Explanation
Exceeding design RPM increases flutter because a blade's resonance frequency is approached; this aeroelastic instability leads to catastrophic failure. This is more likely than opaque plume, which signals incomplete combustion, rather than overspeed, and stall is a different instability.
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