Elevator Mechanic Practice Exam

Which of the following maintenance procedures addresses the issue of proper DC generator commutation?

1. Calibration of electric connections

2. Continued contact between brushes and commutator

3. Lubrication of mechanical parts

4. Synchronization of generator phases

The correct answer is: Calibration of electric connections

The correct choice focuses on the continued contact between brushes and the commutator, which is essential for ensuring proper commutation in a DC generator. Commutation refers to the process of switching the current direction in the armature windings through the brushes and commutator. Proper contact ensures that the brushes can effectively transfer the electrical current generated by the rotating armature without causing significant sparking or wear. When the brushes maintain good contact with the commutator, it minimizes the risk of electrical disturbances and allows for smoother operation of the generator, leading to more efficient performance and longevity of the generator components. While calibration of electric connections can help ensure proper functionality, it does not specifically address the interaction needed for proper commutation. Lubrication of mechanical parts is important for reducing wear and tear but does not directly influence commutation performance. Synchronizing generator phases is more relevant to multi-phase systems and does not pertain to the commutation of a single DC generator.