Where should you look for signs of rubbing on an exciter?

When inspecting an exciter, it's critical to look for signs of rubbing between the rotor and stator. The rotor and stator are essential components of the exciter, where the rotor typically spins within the stationary stator. If there is any misalignment or wear, it can lead to physical contact between these two parts, resulting in rubbing. This rubbing can generate heat and cause damage to both the rotor and stator, leading to performance issues and even failure of the exciter.

By focusing on this area, technicians can identify potential problems early, preventing more significant failures that could disrupt electrical power production. Regular checks for signs of wear or contact in this region are vital for maintaining the exciter's operational reliability and extending its lifespan. The other options, such as electrical connections, outer casing, or the control panel, are important for overall safety and operation, but they do not directly pertain to the critical interaction between the rotor and stator where rubbing would most likely occur.