ITI Electrician, 2nd Year Quiz Question for CBT NIMI Exam.

1. 1. What is the main reason for using a star-delta starter in a three-phase motor?

2. 2. What is the function of a Buchholz relay in a transformer?

3. 3. What happens if the power factor of an electrical system is too low?

4. 4. In a synchronous generator, what happens when the load increases?

5. 5. What is the primary cause of transformer humming noise?

6. 6. What is the function of an ELCB?

7. 7. Why are high-voltage transmission lines preferred for long distances?

8. 8. What happens if a DC motor loses its field excitation?

9. 9. What is the purpose of a commutator in a DC motor?

10. 10. What is the main advantage of an auto-transformer over a two-winding transformer?

11. 11. What does a slip ring in an AC motor do?

12. 12. What type of circuit breaker is used for high-voltage applications?

13. 13. What is the unit of electrical energy?

14. 14. What does an oscilloscope measure?

15. 15. What is the function of a diode in an electrical circuit?

16. 16. What is the main function of a capacitor start motor?

17. 17. What happens when an AC generator runs at a speed lower than its rated RPM?

18. 18. What is the main purpose of a harmonic filter in an electrical system?

19. 19. What type of earthing is preferred for high-voltage substations?

20. 20. What does a power factor of 0.8 indicate?