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Which risk significantly increases when operating a turbojet engine beyond redline?

A)Compressor surge and catastrophic failure
B)Increased fuel efficiency at high RPMs
C)Reduced turbine blade creep rate
D)Improved mixing, lower NOx emissions

💡 Explanation

Compressor surge results from exceeding design airflow limits; this causes flow reversal disrupting airflow. This stalls the compressor because the angle of attack increases, therefore compressor surge rather than improved efficiency or decreased creep occurs because proper air compression rapidly deteriorates.

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