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Electrical Engineering - Polyphase Induction Motors MCQs
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Electrical Engineering - Polyphase Induction Motors MCQs
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25 Questions

1. In a three-phase induction motor, the number of poles in the rotor winding is always
2. In medium sized induction motors, the slip is generally around
3. The ‘cogging’ of an induction motor can be avoided by
4. Stepless speed control of induction motor is possible by which of the following methods ?
5. It is advisable to avoid line starting of induction motor and use starter because
6. Insertion of resistance in the stator of an induction motor
7. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ?
8. Rotor rheostat control method of speed control is used for
9. Star-delta starting of motors is not possible in case of
10. In a star-delta starter of an induction motor
11. DOL starting of induction motors is usually restricted to
12. 5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?
13. In an induction motor the relationship between stator slots and rotor slots is that
14. The maximum torque in an induction motor depends on
15. If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as
16. Blocked rotor test on induction motors is used to find out
17. In three-phase squirrel-cage induction motors
18. Which motor is preferred for use in mines where explosive gases exist?
19. The term ‘cogging’ is associated with
20. For driving high inertia loods best type of induction motor suggested is
21. The purpose of using short-circuit gear is
22. Less maintenance troubles are experienced in case of
23. In squirrel cage induction motors, the rotor slots are usually given slight skew in order to
24. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero ?
25. In case of the induction motors the torque is

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