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For a self-excited DC shunt generator Ia = _____________

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For a self-excited DC shunt generator Ia = _____________

(a) IL – If

(b) IL + IL

(c) – IL – IL

(d) – IL + IL

This question was addressed to me in a job interview.

This key question is from Characteristics of Self Excited Generator in chapter DC Generator of DC Machines

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The correct answer is (b) IL + IL

To elaborate: For a self-excited DC shunt generator field winding is connected in parallel with armature winding so that, armature current splits into load current and field current. Load current will be given out as the machine is working as a generator.

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