- 1. The frame of an induction motor is usually made of
- 2. In an induction motor, no-load the slip is generally
- 3. In case the air gap in an induction motor is increased
- 4. Slip rings are usually made of
- 5. A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be
- 6. In induction motor, percentage slip depends on
- 7. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be
- 8. The number of slip rings on a squirrel cage induction motor is usually
- 9. The starting torque of a squirrel-cage induction motor is
- 10. The term 'cogging' is associated with
- 11. Star-delta starting of motors is not possible in case of
- 12. The good power factor of an induction motor can be achieved if the average flux density in the air gap is
- 13. An induction motor with 1500 r.p.m. speed will have
- 14. An induction motor is identical to
- 15. Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ?
- 16. In the circle diagram for induction motor, the diameter of the circle represents
- 17. The crawling in the induction motor is caused by
- 18. Stepless speed control of induction motor is possible by which of the following methods ?
- 19. It is advisable to avoid line-starting of induction motor and use starter because
- 20. Rotor rheostat control method of speed control is used for
- 21. For which motor the speed can be controlled from rotor side ?
- 22. If any two phases for an induction motor are interchanged
- 23. The maximum torque in an induction motor depends on
- 24. In a three-phase induction motor, the number of poles in the rotor winding is always
- 25. The power factor of an induction motor under no-load conditions will be closer to
- 26. Size of a high speed motor as compared to low speed motorfor the same H.P. will be
- 27. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor
- 28. Which type of bearing is provided in small induction motors to support the rotor shaft?
- 29. The starting torque of a 3-phase squirrel cage induction motor is
- 30. In case of 3-phase induction motors, plugging means
Most important mcq of AC Motor
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