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Electrical interview questions – page 29

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  1. Why we generate power at multiple of 11 i.e 11kv,33kv etc.

  2. Is it required to use 2 nos of body earthings to any machinethough if we use TP with E supply is provided to Machine?

  3. In India,we use 230V,50HZ,where as many other countries use 110V,60HZ what r d advantages and disadvantages of each of them?

  4. Why voltge arev transformed in to 132KV/66/KV/33KV like that

  5. How to find motor contactor rating and bimetalic relay rating? of 30kw motor which will operate on star-delta starter?

  6. WHAT IS THE USE OF STARTER ?????????

  7. How to caluculate APFC panel rating, my running Load is 1320KW, Present P.F 0.76 to 0.8 we need 0.98 p.f

  8. Why Batteries are rated as AH i.e AmpereHour,and its formula to converting AmpHour to Amp

  9. In terms of electrical enhineering, give a detailed explanation of the "earth fault loop path"

  10. Can we load Power capicitors on DG sets?

  11. What is the voltage b/w nutral and earth

  12. Define frequency ?

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  14. Why use only DC supply to charge batteries why not AC Supply??

  15. How we can calculate which capacity capacitor bank we have to add for improve pf?

  16. Why we are testing cables with DC supply not with AC supply?

  17. From which formula we select a capacitor rating?

  18. What is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.

  19. In ONAN type transformer winding temperature is lower than oil temperature at evening time but morning winding temp is higher than oil temp what is the reason?

  20. How many types of lightings are there

  21. HOW many Types of Protection we are using in SDH?

  22. Do you know how to joint the H.T and L.T Cables?

  23. How to calculate meter constant @ HT yard

  24. What is the different bet'n "Active & passive" sensors

  25. In our factory there is one no. of Series trip HT 6KV OCB. 1. Is it possible to measure CT out put current by 440V Clamp meter? The measurement is required for knowing the exact value of current in CT secondary to set up protection for transformers.2. plase forward the single line diagram of AMF panel?

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  27. How calculation to be done of cable size/o.h. conductor size of 11kv h.t.for the load of 2175 kw

  28. Two different rating of generator going to connect parallel, can it set same DROOP or different. Why? Please explain

  29. What should be the conservator minimum oil level required in 2 mva transformer

  30. What pressure results for a flow transmitter of range 0-180t/h in the dcs and 0-301mbar in the field using square root extraction. Kindly also suggest formulae for the percentages 0,25,50,75,100?

  31. CONTACTORS ARE MADE UP OF WHICH MATERIAL?

  32. What will hapen if secodery circuit is open of current transformer

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