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What will happen if field resistance is decreased?

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What will happen if field resistance is decreased?

(a) No load voltage will decrease

(b) No load voltage will increase

(c) No change in no load voltage

(d) Field current will decrease

The question was posed to me in semester exam.

Asked question is from Characteristics of Self Excited Generator topic in section DC Generator of DC Machines

1 Answer

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Right choice is (b) No load voltage will increase

The explanation is: When field resistance is decreased, it will increase field current by Ohm’s law. Thus, field resistance line will lie below the older line of field resistance. Eventually, it’ll intersect OCC afterwards causing increase in no-load voltage.

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