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Electrical interview questions – page 28

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  1. What is the selection & Designing procedure for DG/Transformer

  2. What is the diff of mcb and mccb

  3. How we can calculate the transformer size.

  4. What is the difference between the diode and the rectifier

  5. What is the Designing & Selection Procedure for a DG/Transormer of rated capacity?

  6. What is hysterisis loss and eddy current loss? how it occurs?

  7. What will happen if the secondary of current transformer kept open....

  8. Why is making current of CB always greater than CB breaking burrent?.

  9. Can we use inductor in case of d.c.,if yes then what will happen in circuit

  10. Why Power generation in India is at 50Hz while in Americaits 60Hz so is there any advantage/Disadvantage of this ??

  11. DC Motors applications used in Lift/Elevators

  12. WHAT IS THE DIFFERENCE BETWEEN AN ACB & mccb 7 WHAT IS THE CRITERIA WHEN TO USE WHICH OF THE TWO

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  14. Why we use 2core cable for Dc motor.Can I use 3core?

  15. Why we have to know the specific frequency of any equipment?does anybody know about specific frequency ?

  16. What is insulation percentage of motor 3 phase and singlephase

  17. What is oti and wti

  18. Why there is a temperature rise at different metal to metal contact at cable lug??suppose cable is aluminium and the lug is copper,than why the temperature rise takes place??

  19. Explain about relays..Can we give both AC and DC to the same relay...How it is energising..Explain its working..

  20. What is the difference between air & vaccum circuit breakers?

  21. What are the different types of circuit breakers?

  22. What are insulation classes? Tell examples of each of them.

  23. How to calculate % Impedence?

  24. Where & Why we are using SURGE PROTECTION ?

  25. What is the difference between upper impedance and lowerimpedance distance relay?

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  27. What is ht lt switchgear.

  28. If AVR fails in alternator. what will be the effect.

  29. WHY WE USE SERIES REACTOR IN POWER SYSTEM?

  30. Brief working principle of fluorcent tubelight,function of starter & choke.

  31. What is the full form of SON-T lamp?

  32. If we touch the Capacitor terminals you feel shock after the capacitor was put in operation and not in case of inductor though both are energy storage elements.why?

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