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Wireman Practice Test: Synchronous Motor
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Avg score: 67% • Most missed: “Which one of the following is the application of synchronous motors ?”
A synchronous motor is an AC electric motor that rotates at the same speed as the rotating magnetic field in the stator. The rotation period of the rotor is equal to the rotating field of the machine it is inside of.  Synchronous motors convert electric energy into mechanical energy and rely on the principle of interaction between the rotating magnetic field of the rotor and stator.  The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is determined by the frequency of the power supply and the number of poles of the... Show more
Wireman Practice Test: Synchronous Motor
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25 Questions

1. The construction of a synchronous motor resembles
2. In which of the following motors the stator and rotor fields rotate simultaneously?
3. The maximum power developed In the synchronous motor will depends on……………….
4. Which is the disadvantages of low power factor
5. The back emf set6 up in the stator of a synchronous motor will depends on ……………….
6. The angle between the rotating stator flux and rotor poles is called _____ angle.
7. An over excited synchronous motor works at…………………
8. When load on a synchronous is increased its armature current is increased provided it is …………….
9. Power factor of a synchronous motor is unity when
10. A synchronous motor will always stop when
11. Power factor can be improve by………………….
12. A synchronous motor can develop synchronous torque …………………………
13. A three phase synchronous machine will have ……………. Rings
14. The purpose of damper winding used in the synchronous motor is to ……………….
15. Synchronous motor can operate at……………..
16. The damping winding in asynchronous motor is generally used ……………..
17. Hunting in a synchronous motor takes place
18. An over excited synchronous motor is used for
19. In a synchronous motor, the maximum power developed depends on all of the following except
20. Which one of the following characteristic is NOT applicable to synchronous motors ?
21. Which is the advantage of higher power factor?
22. A synchronous motor working at leading power factor can be used as
23. An important advantage of a synchronous motor over wound round induction motor is that
24. In a synchronous motor the damper winding is provided to………………
25. The motor suitable for load where constant speed is required is………………..

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