After overhaul, what must be done to a DC generator before it can produce electricity?

After overhaul, what must be done to a DC generator before it can produce electricity?

• A. The field must be flashed to restore residual magnetism.
• B. New brushes must be installed.
• C. The stator windings must be replaced.
• D. The governor must be reset.

Answer: (A)

After overhaul, a DC generator needs a small initial magnetism in its field to start producing electricity. This is achieved by flashing the field, which briefly energizes the field windings with an external DC source. The tiny residual magnetism left in the machine’s iron core, or the magnetism built up during the flash, provides enough flux for the armature to generate a voltage. Once the generator begins to produce voltage, the field can be excited normally and rise to its operating level. Without flashing, there may be too little initial flux to start generation. New brushes aren’t required just to produce electricity unless they’re worn or damaged. Replacing stator windings isn’t a standard step after an overhaul unless there’s a fault. Resetting the governor isn’t about electrical generation itself; it’s about control of engine speed, not the generator’s ability to generate power.

After overhaul, a DC generator needs a small initial magnetism in its field to start producing electricity. This is achieved by flashing the field, which briefly energizes the field windings with an external DC source. The tiny residual magnetism left in the machine’s iron core, or the magnetism built up during the flash, provides enough flux for the armature to generate a voltage. Once the generator begins to produce voltage, the field can be excited normally and rise to its operating level. Without flashing, there may be too little initial flux to start generation.

New brushes aren’t required just to produce electricity unless they’re worn or damaged. Replacing stator windings isn’t a standard step after an overhaul unless there’s a fault. Resetting the governor isn’t about electrical generation itself; it’s about control of engine speed, not the generator’s ability to generate power.