Which of the following describes a risk of rotor imbalance and how to prevent it?

• A. Vibration and mechanical damage; prevent by balancing loads, using identical tubes, inspecting rotor integrity, and adhering to load limits.
• B. Increased wear on seals and gaskets.
• C. Electrical interference; prevent by shielding.
• D. Faster rotor rotation; prevent by reducing speed.

Answer: (C)

Rotor imbalance creates an uneven distribution of mass around the axis, so as the rotor spins the centrifugal forces aren’t centered. That produces vibration, which can propagate through bearings, seals, and the rotor housing, causing mechanical wear, fatigue, misalignment, and potential damage over time. The best way to prevent this is to keep the rotating assembly mass evenly distributed and within design tolerances: balance the loads so the mass is symmetrical, use identical components to avoid introducing mass differences, inspect the rotor for cracks, dents, or deformation that could cause imbalance, and strictly follow load limits. Regular maintenance and, if needed, dynamic balancing during service help catch and correct any emerging imbalance. Other listed risks—like wear on seals and gaskets or electrical interference—are not primary consequences of rotor imbalance, and simply reducing speed does not address the underlying imbalance.