Question

Name four excitation methods for exciting the alternator rotor assembly.

Option 1: Clapping, singing, dancing, shouting
Option 2: Permanent magnets, brushes, residual magnetism, pilot exciter
Option 3: Wind turbines, solar panels, hydroelectric dams, coal power plants
Option 4: None of the above

Answer 1

The four excitation methods for exciting the alternator rotor assembly in an electric generator are permanent magnets, brushes, residual magnetism, and pilot exciter.

Step-by-step explanation:

The excitation methods for exciting the alternator rotor assembly in an electric generator are:

1. Permanent magnets: In this method, permanent magnets are placed on the rotor assembly. As the rotor rotates, the magnetic field of the magnets induces an alternating current in the stator windings.
2. Brushes: Brushes are used to connect the rotor windings to an external power source. The power source supplies direct current to the rotor, which creates a magnetic field and induces an alternating current in the stator windings.
3. Residual magnetism: This method relies on the residual magnetism left in the rotor after it was previously magnetized. When the rotor rotates, the residual magnetism induces an alternating current in the stator windings.
4. Pilot exciter: A pilot exciter is a small generator that supplies direct current to the rotor windings. This direct current creates a magnetic field that induces an alternating current in the stator windings.