Published On: Sat, Feb 5th, 2022

1oo Practical illustrated test questions from electrical machines – 1

Author: Radoje Janković.

Photos: Author, colleagues and friends.

Note: I designed and formed all the questions on the “spot” according to the photo. I did not use any literature.


In this group of issues, electric motors, servicing and rewinding are covered in almost detail. All questions are from practice. Each question is illustrated with an appropriate photograph. Readers should give short precise answers based on the photo and knowledge of electric machines or complete the offered answer. For some questions, a more detailed answer is desirable in accordance with the practical knowledge of this issue. There are no such collections of assignments or compulsory manuals in educational publishing.

1. Kako se zovu ovi elementi statorskog namotaja  motora?

1. What are the names of these elements of the stator winding of a motor?

2. Koliki broj polova ima ovaj stator ?

2. How many poles does this stator have?

3. Šta prikazuje ova slika. Opišite ukratko!

3. What this picture shows. Describe briefly!

4. Šta vidite na osvoj slici? Opišite ukratko!

4. What do you see in the winning pictures? Describe briefly!

5. Kako se zove ova strana sa izvodima iz namotaja statora.

5. What is the name of this side with the stator windings?

6. Zašto na ovom postolju za motanje kanura namotaja za motore ima 6 koturova bakarne žice?

6. Why are there 6 coils of copper wire on this stand for winding the motor windings?

7. Zašto su na magnetnom kolu ovog rotora urezani žlebovi? Objasnite!

7. Why are grooves incised on the magnetic circuit of this rotor? Explain!

8. Šta prikazuje ova slika i koja vrsta spoja je izvedena?

8. What does this picture show and what type of connection is made?

9. Kako se zove ova vrsta radne operacije kod namotaja motora? Koji material je korišćen?

9. What is the name of this type of operation for motor windings? What material was used?

10. Kako se zova ovaj vid izolacije namotaja trofaznih motora? Koji material je korišćen za ovu izolaciju?

10. What is the name of this type of insulation of three-phase motor windings? What material was used for this insulation?

11. Na osnovu ove slike pokušajte utvrditi broj žlebova na statoru trofaznog elektromotora ako po fazi ide ovoliko kanura?

11. Based on this picture, try to determine the number of slots on the stator of a three-phase electric motor if there are so many cannons per phase?

12. Kako se zove ova strana statorskog namotaja ?

12. What is the name of this side of the stator winding?

13. Kako se zove ova šema a kako drugi oblik iste ove šeme namotaja motora?

13. What is the name of this winding and what other form of the same motor winding circuit?

14. Kako se zove ovaj veoma precizan instrument?

14. What is the name of this very precise instrument?

15. Ovaj namotaj je:

A) dvosloji,

B) jednoslojni?

15. This winding is:

A) two layers,

B) single layer?

16. n = 2900 rpm.

Koliki je broj polova i broj pari polova?

Namotaj je…

A) dvoslojnog ili B) jednoslojnog tipa?

16. n = 2900 rpm.

What is the number of poles and the number of pole pairs?

Winding is…

A) two-layer or B) single-layer type?

17. A) Kako se zove ova operacija koju majstor izvodi?

B) Kako se zove izolacija koja se vidi izmeđi grupa kanura namotaja?

17. A) What is the name of this operation performed by the master?

B) What is the name of the insulation that is seen between the groups of canoe windings?

18. O kojem tipu rotora se radi na ovoj slici?

18. What type of rotor is in this picture?

19. Da li je ovaj rotor spreman za početak procesa namotavanja?

19. Is this rotor ready to start the winding process?

20. Kako se zove ovaj tip rotora?  Da li je spreman za ubacivanje namotaja?

20. What is the name of this type of rotor? Is it ready to insert the coil?

21. Kako se zove ovaj deo elektro motora? Koju vezu prikazuje?

21. What is the name of this part of a three-phase motor? What kind of connection shows? 

22. Šta prikazuje ova slika?

22. What does this picture show?

23. Šta prikazuje ova slika?

23. What does this picture show?

24. Koji tip namotaja je ovde u pitanju?

24. What type of winding is in question here?

25. Šta vidite na ovoj slici?

25. What do you see in this picture?

26. S leve na desno, koji su nazivi za prvi i drugi namotaj?

 26. From left to right, what are the names for the first and second windings?

27. Šta prikazuje ova slika? Da li se ovde radi o visokom ili niskom naponu koji se dovodi na ove stezaljke?

27. What does this picture show? Is this high or low voltage applied to these terminals?

28. Kako se zove ovaj namotaj?    

28. What is the name of this coil?

29. Ova DC mašina ima 2 vrste polova. Koji su to polovi i koliko ih ima?

29. This DC machine has 2 types of poles. What are these types and how many are there?

30. Na slici vidimo dva glavna dela jednog trofaznog motora. Kako se zovu delovi?

30. In the figure we see the two main parts of a three-phase motor. What are the parts called?

31. Šta prikazuje ova slika?

31. What does this picture show?

32. Da li se ovde radi o dvoslojnom ili jednoslojnom namotaju?

32. Is this a two-layer or a single-layer winding?

33. Ovo je

A) Dvoslojni namotaj,

B) Jednoslojni namotaj?

33. This is

A) Two-layer winding,

B) Single layer winding?

34.  A. O kojoj radnoj opericiji prikazanoj na ovo slici se radi?

B. Kako se zove ovaj, jedan od najglavnijih delova jednog trofaznog asinhronog elektromotora?

34. A. Which work operation is shown in this figure?

B. What is the name of this, one of the main parts of a three-phase asynchronous electric motor?

35. Šta vidite na ovoj slici? Objasnite ukratko !

35. What do you see in this picture? Explain briefly!

36. Za namotavanje ovog statora upotrebljena je bakarna žica sa …….. izolacijom?

36. Copper wire with …… .. insulation was used to wind this stator?

37. Šta vidite na ovoj slici? Objasnite detaljnije!

37. What do you see in this picture? Explain in more detail!

38. Koji tip bakarne žice je primenjen za namotaje ovog statora?  Objasnite malo detaljnije !

38. What type of copper wire is used for the windings of this stator? Explain in a little more detail!

39. Na ovoj slici je prikazan …

A) jednoslojni

B) dvoslojni namotaj?

39. This picture shows…

A) single layer

B) two-layer winding?

40. Šta prikazuje ova slika?

40. What does this picture show?

41. Koja se izolacija primenjuje za žlebove statora elektro motora? Navedite sve tipove izolacije koje znate. Kako se ova izolacija žlebova na slici zove?

41. What insulation is applied to the stator slots of electric motors? List all types of insulation you know. What is the name of this insulation of slots  in the picture?

42. Koliko polova odnosno pari polova ima ovaj stator elektromotora?

42. How many poles or pole pairs does this stator of an electric motor have?

43. Šta prikazuje ova slika? Opišite!

43. What does this picture show? Describe!

44. Kako se zove ovaj deo namotaja ispred statora motora?

44. What is the name of this part of the winding in front of the motor stator?

45. Kako se zove ovaj “omotač” sa leve strane na ovom rotoru? Zašto je on potreban?

45. What is the name of this “wrapper” on the left side of this rotor? Why is he needed?

46. Kako se zove ova strana namotaja na statoru trofaznog elektromotora? Koji se materijal koristi za učvršćivanje glava namotaja?

46. ​​What is the name of this side of the winding on the stator of a three-phase electric motor? What material is used to fasten the winding heads?

47. Na ovoj slici vidimo…

A) jednoslojni namotaj,

B) dvoslojni namotaj,

47. In this picture we see…

A) single-layer winding,

B) two-layer winding,

48. Na ovoj slici vidimo kružnu šemu trofaznog namotaja, sa tri ili šest izvoda za rednu-trougaonu ili dve-paralelne trougaone veze namotaja?

A) Da, B) Ne.

48. In this figure we see a circular scheme of a three-phase winding, with three or six leads for a series-triangular or two-parallel triangular winding connection?

A) Yes, B) No.

49. Šta prikazuje ova slika?

49. What does this picture show?

50. Ova slika prikazuje …

A) početak ubacivanja kanura jednoslojnog namotaja jednog trofaznog elektromotora.

B) Početak ubacivanja kanura dvoslojnog namotaja jednog trofaznog elektromotora.

50. This image shows…

A) the beginning of the insertion of the single-layer winding of one three-phase electric motor.

B) Start of inserting the two-layer winding of one three-phase electric motor

About the Author

- Radoje - Rade Jankovic Electrician, Electrical Technician, Electrical Engineer, PhD, Ecologist, Environmentalist, Designer, Educator, Investigator... Today PROFESSIONAL TECHNICAL WRITER AND DOCUMENTATOR Massive practical experience in almost all fields of electrical engineering over 40 years. My International education group in Facebook: EEEW - ELECTRICAL & ELECTRONIC EDUCATION WORLD where published more than 8000 small or bigger articles, lessons, technical advice, projects, technical calculations, test questions with and without answers, illustrated test questions with and without answers; all my original works and few thousands of may original photos from practice, drawings, circuit diagrams, environmental lessons and examples from everyday practice etc., etc.

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1oo Practical illustrated test questions from electrical machines – 1