Discussion
The voltage a shunt generator settles at is fixed by
Answer: B
Correct answer: the intersection of the magnetisation curve and the field resistance line
Two conditions must be satisfied at once: the emf must be that which the magnetisation curve gives for the field current flowing, and the field current must be that which the field resistance passes at the emf generated. Build-up therefore continues until the two agree, that is until the straight field resistance line crosses the magnetisation curve, and the machine settles there. Residual magnetism only starts the process; the speed and the field resistance determine where it ends.
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