Magnetic field in a D.C. generator is produced by_______________?
Correct answer: A. electromagnets
- A. electromagnets
- B. permanent magnets
- C. both A. and B.
- D. none of the above
Explanation
In the conventional DC generator, the magnetic field is produced by field-winding electromagnets, whose excitation can be separately supplied or self-excited. Permanent magnets are used in special permanent-magnet DC generators, not the usual machine assumed here.
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