Discussion
Armature reaction in a synchronous generator supplying a lagging power factor load is
Answer: B
Correct answer: mainly demagnetising
With a lagging current the armature mmf is very nearly in opposition to the main field, so it subtracts from it. The terminal voltage falls with load and the excitation must be increased to hold it - which is why a lagging power factor gives the worst voltage regulation and why regulation is quoted at a stated power factor.
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