What are the four main parts of a DC generator?

• A. field frame, armature, commutator, brush assembly
• B. field frame, rotor, stator, capacitor
• C. stator, rotor, commutator, brush
• D. armature, rotor, stator, diode

Answer: (A)

The main idea is how a DC generator produces direct current by using four essential components that work together as the rotor spins in a magnetic field and the output is rectified for DC use. The field frame provides the stationary magnetic field in which the armature rotates. The armature is the rotating winding where voltage is induced as it cuts through the magnetic flux. The commutator is a split-ring device attached to the armature that reverses the connection of the winding to the external circuit every half turn, converting the generated alternating voltage into direct current. The brush assembly uses carbon brushes to maintain contact with the moving commutator so the current can be drawn off to the external circuit. As the armature spins, its windings generate AC, and the commutator reverses the connections to deliver DC to the load. The other terms describe different machine parts or add-ons not part of this four-part arrangement, such as generic rotor/stator terminology or components like a capacitor or diodes that aren’t the fundamental DC generator components.