In D.C. machines the residual magnetism is of the order of_________________?
Correct answer: A. 2 to 3 per cent
- A. 2 to 3 per cent
- B. 10 to 15 per cent
- C. 20 to 25 per cent
- D. 50 to 75 per cent
Explanation
Residual magnetism in a D.C. machine is normally only a small fraction of the rated flux, approximately 2 to 3 percent. It is nevertheless sufficient for self-excitation in a shunt generator.
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