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Emf produced by DC machine, for zero armature current (E1) and non-zero armature current (E2) can be related as__________

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Emf produced by DC machine, for zero armature current (E1) and non-zero armature current (E2) can be related as__________

(a) E1 = E2

(b) E1 > E2

(c) E1 < E2

(d) Can’t be determined

I got this question in semester exam.

Origin of the question is EMF and Torque Production in division Circuit Model, Emf and Torque of DC Machines

1 Answer

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Best answer
Right option is (a) E1 = E2

Best explanation: In a DC machine flux density wave in the air gap is flat topped with quarter wave symmetry as long as armature current is equal to 0. For non-zero value of armature current, this quarter wave symmetry is disturbed because of armature reaction. Emf produced is independent of B-wave shape, thus we will get same value for both cases.

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