Which statement best describes a brushless generator's reliability?

• A. More moving parts
• B. Requires more maintenance
• C. Lower reliability
• D. Fewer moving parts and higher reliability

Answer: (D)

Brushless generators gain reliability mainly because they eliminate the wear-prone carbon brushes and slip rings found in brushed designs. Without those contact points, there’s far less friction, sparking, and routine wear, so maintenance is reduced and the chance of a failure related to brush wear drops significantly. The excitation is handled electronically or by a stationary exciter with a rectifier, which avoids the cycling wear and arcing that can occur at brushes, leading to a more stable and predictable operation. While there are still moving parts like bearings, the overall design has fewer wear-prone components, which translates to higher reliability in service. That combination—fewer wear items and more reliable excitation—explains why this option is the best description.