Discussion
Match the curve with what it plots against field current.
1. V-curve 2. Inverted V-curve 3. Power-angle curve
P. Power against load angle Q. Armature current R. Power factor
Answer: D
Correct answer: 1-Q, 2-R, 3-P
Three curves describing three relationships. The V-curve plots armature current against field current and dips to a minimum at normal excitation. The inverted V-curve plots power factor against field current and peaks at the same point. The power-angle curve is different in kind, plotting power against load angle at fixed excitation.
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