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The external characteristic is plotted between ____________

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The external characteristic is plotted between ____________

(a) terminal voltage vs armature current at constant excitation

(b) terminal voltage vs field current at constant armature current

(c) induced armature emf vs armature current at constant excitation

(d) none of the mentioned

The question was posed to me in final exam.

This interesting question is from Operating Characteristics of DC Generators topic in portion DC Generators of Electrical Machines

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Correct answer is (a) terminal voltage vs armature current at constant excitation

For explanation: The external characteristic is plotted between terminal voltage and armature current at fixed excitation.

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