Which statement best describes a brushless generator's reliability?

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.

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.