A synchronous motor on load draws a current at a leading power factor angle Φ.
If the internal power angle ____ which is the phase angle between the excitation emf and the current in the phasor diagram is Ψ, then the air-gap excitation mmf lags behind the armature mmf.
B. (π/2) + Ψ
C. (π/2) - Ψ
D. Ψ + Φ
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