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

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Question 1 of 37

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

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Question 2 of 37

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

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Question 3 of 37

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

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Question 4 of 37

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

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Question 5 of 37

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

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Question 6 of 37

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

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Question 7 of 37

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

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Question 10 of 37

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

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Question 11 of 37

11. 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 12 of 37

12. 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 13 of 37

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

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Question 14 of 37

14. 59. What is the function of collar?

 

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Question 15 of 37

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

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Question 16 of 37

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

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Question 17 of 37

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

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Question 18 of 37

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

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Question 19 of 37

19. 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 20 of 37

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

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Question 21 of 37

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

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Question 22 of 37

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

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Question 23 of 37

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

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Question 24 of 37

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

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Question 25 of 37

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

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Question 26 of 37

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

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Question 27 of 37

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

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Question 28 of 37

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

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Question 29 of 37

29. 54. What refers coil in AC winding?

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Question 30 of 37

30. 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 31 of 37

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

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Question 32 of 37

32. 63. Where the panel boards are used?

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Question 33 of 37

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

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Question 34 of 37

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

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Question 35 of 37

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

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Question 36 of 37

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

Question 36 of 37

Question 37 of 37

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

Question 37 of 37


 

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