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Which of the following is not a reason, behind failing of self-exciting machine?

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Which of the following is not a reason, behind failing of self-exciting machine?

(a) Residual magnetism is absent

(b) Negative feedback

(c) Field resistance value is more than critical resistance value

(d) Armature resistance is non-zero

This question was addressed to me during an online exam.

The query is from Characteristics of Self Excited Generator topic in portion DC Generator of DC Machines

1 Answer

+1 vote
by (1.2m points)
Right choice is (d) Armature resistance is non-zero

The explanation is: In case a and b, machine will tend to destroy the residual magnetism present in a core, which will not excite machine. When field resistance value is more than critical value as seen from OCC, machine will not excite to appropriate value.

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