Discussion
A shunt generator that fails to build up may have
Answer: A
Correct answer: lost its residual magnetism
Without residual flux there is no initial emf, so no field current flows, so no flux is produced - the process has nothing to start it. The cure is to flash the field from a battery, restoring the residual magnetism. The other common causes of failure to build up are a field resistance above critical, a speed below critical, and field connections reversed so that the initial current destroys the residual flux instead of reinforcing it.
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