ELECTRICIAN 2nd YEAR MODULE – AC. Three Phase Motor SET 02 ONLINE TEST

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Question 1 of 37

1. 72. Calculate the phase displacement in terms of slots for a 3 phase, 36 slots, 12 coils, 4 pole stator winding?

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Question 2 of 37

2. 66. What is the purpose of using rotor resistance starter to start 3 phase slip ring induction motor?

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Question 3 of 37

3. 51. Which is the main property of leatheroid paper insulation?

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Question 4 of 37

4. 73. Which type of AC motor winding having the number of coil/pole/phase is more than one arranged in different slots?

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Question 5 of 37

5. 55. Which type of AC winding has the number of coil/pole/phase more than one at different pitches?

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Question 6 of 37

6. 78. What is the effect on 3 phase induction motor if one phase is cut-off during running with load?

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Question 7 of 37

7. 61. What is the reason long chord winding is avoided in AC motors?

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Question 8 of 37

8. 84. What is the reason for frequent blowing of fuse after motor running some time?

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Question 9 of 37

9. 85. What happens to a 3 phase induction motor, if one phase fails during starting?

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Question 10 of 37

10. 67. Which method of speed control is only applicable for 3 phase slipring induction motor?

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Question 11 of 37

11. 82. What happens to the rotor of a 3 phase induction motor if its speed attains to synchronous speed?

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Question 12 of 37

12. 71. What is the name of the diagram used for 3phase motor winding?

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Question 13 of 37

13. 56. Calculate the number of coils/phase/pole for a 3 phase double layer distributed winding for a motor having 36 slots, 36 coils and 4 poles.

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Question 14 of 37

14. 58. Which type of starter is used to start and run the 3 phase slip ring induction motor?

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Question 15 of 37

15. 79. What is the defect, if starter with single phasing preventer does not switch ‘ON’?

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Question 16 of 37

16. 75. Why external resistance is included in the rotor circuit at starting through 3 phase slipring induction motor starter?

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Question 17 of 37

17. 54. What refers coil in AC winding?

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Question 18 of 37

18. 77. What happens to a 3 phase induction motor if one phase fails during running?

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Question 19 of 37

19. 57. What is the type of rewinding process?

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Question 20 of 37

20. 68. What is the name of the winding?

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Question 21 of 37

21. 74. Which type of testing of winding is illustrated?

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Question 22 of 37

22. 59. What is the function of collar?

 

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Question 23 of 37

23. 69. What is the name of 3 phase motor winding, if the coil pitch is less than pole pitch?

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Question 24 of 37

24. 70. Which is the demerit of 3 phase concentric winding?

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Question 25 of 37

25. 62. Which type of winding has more space for cooling?

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Question 26 of 37

26. 65. Which type of handle design of rotary switch is illustrated?

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Question 27 of 37

27. 83. What is the effect of open circuit in rotor of an induction motor?

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Question 28 of 37

28. 63. Where the panel boards are used?

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Question 29 of 37

29. 86. Which is the cause for the 3 phase motor starter with single phase preventer trips frequently?

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Question 30 of 37

30. 81. Which fault condition thermal overload relay protects A.C induction motor?

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Question 31 of 37

31. 64. Determine the torque in newton metres produced by a 7.5 HP squirrel cage motor rotating at 1440 rpm?

Question 31 of 37

Question 32 of 37

32. 76. What is the effect of motor, if the rotor windings in slipring induction motor is open circuited at starting?

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Question 33 of 37

33. 53. Which insulation is used for cuffing in AC winding?

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Question 34 of 37

34. 60. Which type of winding wire is used to wind submersible pump motors?

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Question 35 of 37

35. 80. What is the defect in AC 3 phase induction motor runs at low speed if loaded?

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Question 36 of 37

36. 52. Which type of insulating material is selected for binding the coils and over hangs?

Question 36 of 37

Question 37 of 37

37. 87. What indication denotes the shorted coil defect in 3 phase motor stator winding while testing with internal growler by keeping hacksaw blade?

Question 37 of 37


 

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