Engine : Electricity - 31/1386
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| What causes the rotor of a synchronous motor to operate in synchronism with the rotating field? |
| A) the rotor is magnetically locked into step with the rotating magnetic field by the excitation current |
| B) the amortisseur (damper) windings |
| C) the field strength varies directly with rotor slip |
| D) the stator flux rotates in the opposite direction |
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