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Electrical interview questions – page 20

1,095 questions. Tap “Show answer” to check yourself.

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  1. What is the Difference Between MCCB & ACB & VCB

  2. What are the needs of electrical earthing.... other than protection?

  3. How do we know the LT or HT panel trip by some problem which indication will show

  4. If 2500 KVA TRANSFORMER CAPACITY.33KV INCOMING HOW ARE AMPEAR PRIMERY SAID

  5. What is the use of terminals in transformer ?

  6. What are the protection schemes used for protection oftransformers ?

  7. WHY WE USE 4-20mA

  8. What happen when ct secondary are open circuited? why samething is not happen in ordinary transformer?

  9. What is the voltage of insulation megger that should be used for measuring the resitance of 66kv equipments.

  10. Which inert gas is flowing in tube light?

  11. WHAT ARE THE CAUSES

  12. What happens when a power transformer neutral earthing broken???

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  14. What are the complete specifications of a motor?.

  15. Which %age of corona losses increses if frequency isincreased to 25%.

  16. Give me list of material for wiring of 20hp motor?

  17. How to understand the controling circuits example star-delta-starter controling daigram please let me know

  18. What is scan time of PLC & in which factor scan time is decide

  19. Can Induction motor run at over rated speed? ( 15oo rpm is rated speed for 50HZ. is it possible to ride 3000 RPM with same motor with the help of VVVFD for continues ride of 100HZ)

  20. What happan when ac power transmitted in unity power factor

  21. How we calculate the spacing between the conductors in 11,33KV lines?

  22. What is the differnt between open loop and close loop ?

  23. WHAT IS THE THUMB RULE FOR DETERMINING THE CURRENT AND TON OF AN AC?

  24. How many transformer

  25. When neutral is grounded in electrical circuit?

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  27. If any leas acid battery is having low or high sp.gravity taen what will be effect of battery and why

  28. Why 11KV/440V distribution supply use for Domestic use?

  29. Corona happens more in ac or dc?

  30. How we do Vector group ,magnetic balance and tap changer test in Transformer?

  31. What is mean by Sensitive Earth fault & what are the effects

  32. Why the earth pin is thicker than other pins in a plug? Ifit is for reducing resistance, then why the copper earthwire is not so thick as earth pin of socket?

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