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# Chapter 8: Induction Motor

51. The stating torque of the slip ring induction motor can be increased by adding

52. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be

53. The complete circle diagram of induction motor can be drawn with the help of data found from

54. The torque of a rotor in an induction motor under runing condition is maximum

55. What will happen if the relative speed between the rotating flux of stator and rotor of the induction motor is zero?
...

56.

57. Insertion of resistance in the rotor of an induction motor to develop a given torque

58. For driving high inertia loads best type of induction motor suggested is

59. Temperature of the stator winding of a three-phase induction motor is obtained by

60.

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# Chapter 8: Induction Motor

41. Short-circuit test on an induction motor cannot be used to determine

43. In case of 3-phase induction motors, plugging means

44. Which is of the following data is required to draw the circle diagram for an induction motor?

45. In three-phase induction motors sometimes copper bars are placed deep in the rotor to
...

46.

47. The value of transformation ratio of an induction motor can be found by

48. The power scale of circle diagram of an induction motor can be found from

49. The shape of the torque/slip curve of induction motor is

50. A change of 4% of supply voltage to an induction motor will produce a change of approximately

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# Chapter 8: Induction Motor

31. Low voltage at motor terminals is due to

32. In an induction motor the relationship between stator slots and rotor slots is that

33.

35. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move
...

36. It is advisable to avoid line starting of induction motor and use starter because

27. The speed characteristic of an induction motor closely resemble the speedload characteristic of which of the following machines

38. Which type of bearing is provided in small induction motors to support the rotor shaft?

39. A pump induction motor is switched on to a supply 30% lower than its rated voltage. What will eventually happen? It will

40. 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?

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# Chapter 8: Induction Motor-

21. In a three-phase induction motor, the number of poles in the rotor winding is always

22. The speed of a squirrel-cage induction motor can be controlled by all of the following except

23. The 'crawling' in an induction motor is caused by

24. The power factor of an induction motor under no-load conditions will be closer to

25. The `cogging' of an induction motor can be avoided by
...

26. If an induction motor with certain ratio of rotor to stator slots, runs at of the normal speed, the phenomenon will be termed as

27. Slip of a induction motor is negative when

28. Size of a high speed motor as compared to low speed motor for the same H.P. will be

29. A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor

30.  A 3-phase induction motor delta connected in carrying too heavy load and one of its fuses blows out. Then the motor