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At some point If On OCC, the value of voltage obtained which is more than rated voltage is _______

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At some point If On OCC, the value of voltage obtained which is more than rated voltage is _______

(a) Ia *Ra + If *Rf

(b) Ia *Ra

(c) Vd + Ia *Ra

(d) Can’t tell

I have been asked this question in an internship interview.

Question is taken from External and Armature Characteristics of DC Generator topic in portion DC Generator of DC Machines

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Best answer
The correct choice is (c) Vd + Ia *Ra

The best explanation: The difference in the observed value and rated value of voltage can be obtained from the y-axis that is, from Voc. This difference is equal to Vd + Ia *Ra. Thus, by subtracting voltage drop in armature Vd can be found.

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