🔍 Key Concepts

• Function of brushes and slip rings in a generator and why good contact is important • Common causes of brush chatter (vibration, poor contact surface, contamination) • Which maintenance actions actually change contact quality and smoothness at the ring/brush interface

💭 Think About

• Think about which option directly affects how smoothly the brush rides on the slip ring surface during rotation. • Ask yourself: which action would remove small rough spots, dirt, or film that might make the brush bounce? • Consider which options might be unsafe or not standard practice for electrical rotating equipment maintenance.

✅ Before You Answer

• Eliminate any option that would increase electrical resistance at the brush contact point rather than improve it. • Question whether adding lubricants or insulation at the point of electrical contact is normally recommended for generator brushes. • Focus on what standard maintenance step is used to restore a clean, smooth conducting surface between brush and collector ring.