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Electrician Practice Test: AC 3 Phase Motor
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Electrician Practice Test: AC 3 Phase Motor
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25 Questions

1. Which method is used to control the speed of 3 phase induction motor from stator side?
2. Which formula is used to calculate percentage slip of an AC 3 phase induction motor?
3. Which formula is used to calculate the total electrical degree in stator of an AC motor?
4. What is the effect of motor, if the rotor windings in slip ring induction motor is open circuited at starting?
5. Calculate the phase displacement in terms of slots for a 3 phase, 36 slots, 12 coils, 4 pole stator winding?
6. Calculate the number of coils per phase per pair of poles of 3 phase motor having 2 pole, 24 slots,12 coils?
7. What refers coil in AC winding?
8. Which operation the control circuit is used given below?
9. Which type of wire is used for rewinding of AC 3 phase motors?
10. What is the name of the winding given below?
11. Which speed is called as synchronous speed in 3 phase induction motor?
12. What is the name of the coil winding given below?
13. What is the function of timer in automatic star delta starter?
14. What is the reason for frequent blowing of fuse after motor running some time?
15. Which is the cause for the 3 phase motor starter with single phase preventer trips frequently?
16. Why slip ring induction motor is fitted with wound rotor?
17. What is the function of collar given below?
18. What is the starting current of an AC 3 phase induction motor?
19. How pole pitch is measured in terms of slots in AC winding?
20. What is the name of the contact marked as X given below?
21. Which device is used to test stator winding short and open fault?
22. Which type of AC motor winding having the number of coil/pole/phase is more than one arranged in different slots?
23. Which type of testing of winding is illustrated given below?
24. What is the reason of long chord winding is avoided in AC motors?
25. What is the fuse rate to run a 10 HP three phase induction motor at full load?

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