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SYNCHRONOUS MOTOR MCQs – CHAPTER 7 DAE

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1. Synchronous motors generally have





2. Number of slip rings in a 3-phase synchronous motor will be





3. The direction of rotation of a synchronous motor can be reversed by reversing





4. In a synchronous motor, the magnitude of stator back e.m.f. depends on





5. Damper winding is provided in synchronous motor to





6. The V-curves of a synchronous motor show relationship between





7. The angle between the synchronously-rotating stator flux and rotor poles of a synchronous motor is called _______ angle.





8. The maximum value of torque angle α in a synchronous motor is





9. Which of the following is most commonly used technique for starting synchronous motor?





10. Which of the following is an application of synchronous motor?





11. If the field of a synchronous motor is under excited, the power factor will be





12. When load on a normally-excited synchronous motor is increased, its power factor tends to





13. In a synchronous machine when the rotor speed becomes more than the synchronous speed during hunting, the damping bars develop





14. The V-curves of a synchronous motor show relationship between





15. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected





16. An over-excited synchronous motor is used for





17. A synchronous motor running with normal excitation adjusts to load increases essentially by increase in its





18. An over-excited synchronous motor takes





19. A synchronous motor can be started by





20. Synchronous motor always runs at





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