A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — vibration generated by the rotor
High-frequency vibration generated by rotor unbalance, critical speed resonance, or misalignment induces cyclical fatigue stresses in journal bearing Babbitt linings, ultimately causing cracking, wiping, and failure.
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