Discussion
Which of the following condition corresponds to minimum armature current in synchronous motor?
Answer: D
The minimum armature current occurs at unity power factor with no load. In the V-curve the armature current is lowest when the power factor is unity, because then the current is wholly the active component. For a lighter load the minimum is lower, and on no load it is the smallest of all.
At leading or lagging power factors the armature current is larger because of the added reactive component, and a full load needs more active current than a half load. So the fourth option is correct.
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