Single phase Induction motor -- Electrical Engineering (MCQ) questions and answers
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1. In a split phase motor, the running winding should have
2. . If the capacitor of a single-phase motor is short-circuited
3. . In capacitor start single-phase motors
4. . In a capacitor start and run motors the function of the running capacitor in series with the
auxiliary winding is to
5. In a capacitor start motor, the phase displacement between starting and running winding can be
nearly
6. . In a split phase motor
7. The rotor developed by a single-phase motor at starting is
8. Which of the following motor will give relatively high starting torque ?
9. Which of the following motor will have relatively higher power factor ?
10. In a shaded pole motor, the shading coil usually consist of
11. . In a shaded pole single-phase motor, the revolving field is produced by the use of
12. A centrifugal switch is used to dis- connect ‘starting winding when motor has
13. If a particular application needs high speed and high starting torque, then which of the following
motor will be
preferred ?
14. The value of starting capacitor of a fractional horse power motor will be
15. In repulsion motor direction of rotation of motor
16. In a single phase motor the centrifugal switch
17. The running winding of a single phase motor on testing with meggar is found to be ground. Most
probable location of the ground will be
18. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced
by an inductor of equivalent reactance value. It will
19. Which of the following motors is used in mixies ?
20. Which of the following motors is inherently self starting ?
21. The direction of rotation of an hysteresis motor is determined by
22. Burning out of windings is due to
23. Direction of rotation of a split phase motor can be reversed by reversing the connection of
24. Short-circuiter is used in
25. The range of efficiency for shaded pole motors is
26. In a capacitor start single-phase motor, when capacitor is replaced by a resistance
27. The power factor of a single-phase induction motor is usually
28. A shaded pole motor can be used for
29. A hysteresis motor works on the principle of
30. Which of the following motor will give the highest starting torque ?
31. For which of the applications a reluctance motor is preferred ?
32. The motor used on small lathes is usually
33. . Which of the following motors is preferred for tape-recorders ?
34. A single-phase induction motor is
35. A schrage motor can run on
36. . A universal motor can run on
37. Which of the following single-phase motors is suitable for timing and control purposes ?
38. Single phase induction motor usually operates on
39. . In split-phase motor auxiliary winding is of
40. Which of the following motors will operate at high power factor ?
41. In a two value capacitor motor, the capacitor used for running purposes is
42. Which of the following motors can be run on AC. as well as D.C. supply ?
43. In A.C. series motor compensating winding is employed to
44. Which of the following single-phase induction motors is generally used in time phonographs ?
45. Which of the following motors has highest starting torque ?
46. The repulsion-start induction-run motor is used because of
47. In case of a shaded pole motor the direction of rotation of the motor is
48. In case of high speed universal motor which of the following needs more attention ?
49. The wattage rating for a ceiling fan motor will be in the range
50. The wattage of motor for driving domestic sewing machine will be around
51. Which of the following single-phase motors has relatively poor starting torque ?
52. Which type of load is offered by cranes and hoists ?
53. . The speed of a universal motor is generally reduced by using
54. Which of the following motors can be used for unity power factor ?
55. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of
56. . The direction of rotation of universal motor can be reversed the by reversing the flow of current
through
57. . In which single-phase motor, the rotor has no teeth or winding ?
58. Which motor is normally free from mechanical and magnetic vibrations ?
59. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are
considered as suitable for
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