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 tellI 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

At some point If On OCC, the value of voltage obtained which is more t

1.	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 tellI 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
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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