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Which of the following have different external characteristic than other?

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in DC Machines by (506k points)
Which of the following have different external characteristic than other?

(a) Self excited DC shunt generator

(b) Separately excited generator

(c) Compound DC generator

(d) Series DC generator

I got this question in an interview.

Enquiry is from Characteristics of Separately Excited Generators topic in chapter DC Generator of DC Machines

1 Answer

+1 vote
by (1.2m points)
The correct option is (d) Series DC generator

For explanation I would say: Unlike Self excited DC shunt generator, separately excited generator, compound DC generator the voltage at zero load current for DC series motor doesn’t start from some positive non-zero value, instead it starts from origin.

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