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Armature characteristic is drawn across ________

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Armature characteristic is drawn across ________

(a) Ia vs If

(b) Ia vs Vt

(c) If vs Vt

(d) Ea vs Ia

I had been asked this question in an online quiz.

This key question is from External and Armature Characteristics of DC Generator in section DC Generator of DC Machines

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The correct choice is (a) Ia vs If

To explain: Armature characteristic is drawn across Ia vs If. This characteristic is on load characteristic, drawn when terminal voltage and speed of the generator is kept constant. Armature characteristic is regulation characteristic.

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