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Electrical interview questions – page 25

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

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  1. Is there any chance to get shock from the transformer oil at the time of maintenance due to its dielectric property. . ?

  2. What is the technical term when and alternator's prime mover fails.

  3. What is unit of inductance

  4. What will happen to give a dc supply in ac motor?

  5. Why a starter is used for a motor?

  6. What are effect of radio system in DCS Distributed control system ?

  7. In hydro plant,generally we install vertical hydrogenerators..why dont we recommend horizontal one??

  8. How to identified power tranfer line is how much KV????

  9. What are the advantage of UG cables over the over head lines

  10. What is the wattage of 'zero watt' bulb?

  11. How to select Main CB Rating for 220 KW Load?

  12. If generator is running in iso mode parrallel with grid and suddenly grid breaker off what will happen?

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  14. What is the basic difference between fan and home motor if both have single phase induction motor?

  15. Why using in cable mm square which is mm & which is squarewhy using mm & square.

  16. What happen if power factor goss to above unity (one) ? of any electrical system or motor.

  17. What is the working principle of contactor and conditions ofnormal open and normal close on it?

  18. How much excitation voltage required to generate 1mw power?

  19. What are the steps for Testing of 6.6KV HT Panels?

  20. Two bolbs of 100w and 40w respectively connected in series across a 230v supply.which bolb will glow bright and why?

  21. What is the earth resistance ?

  22. Name the earthings?

  23. WHAT IS THE THUMB RULE FOR CALCULATING THE P.F CORRECTION CAPACITOR?? SAY FOR 100 HP MOTOR HOW MUCH MICRO FARAD CAPACITOR IS NEEDED .... THUMB RULE SO QUICK ANSWER WANTED

  24. Describe the Operation of induction generators from bus bars

  25. How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.

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  27. How will u calculate wire size according to current rating?

  28. What is the difference between EMF and Voltage?

  29. What is effect of power factor on change in voltage

  30. WHAT IS B & C CLASS SURGE PROTECTION AND WHAT IS DIFFERENCEBETWEEN B & c CLASS SP

  31. Why transformer are rated in KVA not in watt?

  32. What should be the minimum rating for using HT Motors?

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