The net armature voltage of a synchronous motor is equal to the_______________?
Correct answer: D. vector difference of Eh and V
- A. vector sum of Eb and V
- B. arithmetic sum of Eb and V
- C. arithmetic difference of Eb and V
- D. vector difference of Eh and V
Explanation
The voltage across the synchronous impedance is obtained from the phasor difference between the applied voltage and the back e.m.f., not by ordinary arithmetic subtraction. Option d expresses this vector difference, with “Eh” evidently intended to mean Eb.
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