Electrical Engineering MCQ XYZ
Magnetic field in a DC generator is produced by:
- Permanent magnets
- Electromagnets
- Both of above
- None of these
Correct answer: 1. Permanent magnets
Explanation: In a DC generator, the magnetic field is typically produced by electromagnets rather than permanent magnets. Electromagnets are created by passing an electric current through a coil of wire, generating a magnetic field around the coil. This magnetic field is crucial for the operation of a DC generator as it induces the generation of electrical voltage when the coil rotates within the magnetic field.
While permanent magnets can be used in some generators, they are more commonly found in small and simple generators. Larger generators, especially those used in power plants and industrial settings, usually rely on electromagnets for their ability to control and adjust the strength of the magnetic field by varying the current flowing through the coils.