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External characteristic differ from an internal characteristic in separately excited DC generator by _________

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External characteristic differ from an internal characteristic in separately excited DC generator by _________

(a) Ia *Ra

(b) If *Ra

(c) IL *RL

(d) If *Rf

The question was posed to me in class test.

Question is from Characteristics of Separately Excited Generators topic in chapter DC Generator of DC Machines

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Right option is (a) Ia *Ra

To explain: Internal characteristic is drawn across armature generated voltage, it doesn’t account the presence of armature resistance. External characteristic takes into account the presence of armature resistance as it is drawn across terminal voltage.

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