Discussion
In the phasor diagram of a synchronous motor, the excitation emf
Answer: A
Correct answer: lags the terminal voltage by the load angle
A motor takes power in, so its rotor field is dragged behind the stator field and the excitation emf lags the terminal voltage. In a generator the rotor is driven ahead and the emf leads. The sign of the load angle is therefore what distinguishes the two modes of the same machine.
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