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Ea can be determined using __________

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Ea can be determined using __________

(a) No-load characteristics

(b) Load characteristics

(c) Cannot be determined

(d) Above OCC

This question was addressed to me during a job interview.

The question is from No Load with On Load Characteristics of DC Generator in division DC Generator of DC Machines

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Right option is (a) No-load characteristics

For explanation I would say: Under load conditions Ea cannot be determined from the OCC for If in the saturation region because of the demagnetizing effect of armature reaction. We must therefore determine experimentally the equivalent demagnetizing ampere-turns ATd due to armature reaction under actual load conditions.

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