The correct answer is: B. Commutator
A commutator is a device that converts alternating current (AC) to direct current (DC) in a DC generator. It is a cylindrical metal ring that is divided into segments. The segments are insulated from each other and are connected to the coils of the generator. As the generator rotates, the commutator brushes make contact with the segments and collect the current from the coils. The current is then passed through the brushes to the external circuit.
The commutator is a vital part of the DC generator because it allows the generator to produce DC current. DC current is more stable and reliable than AC current, and it is the type of current that is used in most electrical devices.
The other options are incorrect because they are not directly involved in the production of DC current.
- Dummy coils are used to balance the magnetic field in the generator.
- Eye bolts are used to mount the generator.
- Equalizer rings are used to distribute the current evenly among the coils.