Electrical Q&A

Collection of  Electrical Questions and Answers:

Electrical Question and Answers Part-1

Electrical Question and Answers Part-2

Electrical Question and Answers Part-3

44 Responses to Electrical Q&A

  1. Pranav Jani says:

    Hi Jignesh,

    first of all, many many thanks to organise such a informative contents of electrical engineering. I appreciate this a lot. I have gone through many websites but didnt found so much useful information which I found on your website..brave effort.

    My electrical background is not so fundamental so would like to ask u a question regarding underground cabling of medium voltage cables for pv projects.

    I m looking for indian standards of medium voltage and low voltage cable specification for mega watt pv project.

    Will u pls guide me on this?

    Thank you.

    kind regards,
    Pranav

  2. G.R.Prasad says:

    What is the minimum clearence required around the neutral CT used for REF protection in 415V system.

  3. Senthilkumar says:

    please give details about SC rating design details for MDB and SMDB bus bars

  4. nalini says:

    nice question and answers sir,its very good…

  5. vishwa murthy says:

    Dear Jignesh ji,

    I want to know how to calculate the string efficiency, can you please send/post the details…it will be most helpful for me.

  6. Gnana Reuben says:

    Dear Jigneshji

    Thnaks a lot for the Current ratings, Gland Chart and Q&A Part 1 thru 3

  7. Madhurjya says:

    State whether a lamp rated for 230 V, 60 W can be used for both a.c & d.c supply. Give the reasons to your answers.

  8. selvanayagam.a says:

    hai sir.your Q/A everything useful.but how down load for pdf that about explain me

  9. Adil says:

    Thank u and please keep going

    Very good job

  10. Tshwarelo says:

    I enjoyed data that i got here.

  11. Jones says:

    Its really awesome,

  12. kuppuraj says:

    thank you sir…………………..!

  13. NEHA GETHE says:

    its 2 gud sir…..

  14. kandasamy says:

    very very useful site

  15. dear jignesh sir,
    i want to know that is there any chances of load on energy meter if indivisual neutral is not provide?

  16. how to calculate the current of a transformer?

  17. elias says:

    i like ur page thanks a lot cause i imrove my knowledge. thanks a lot.

  18. Pravin mali says:

    Nice site.thanks sir.

  19. Eneyo Duke says:

    Please is DOL applicable to lamp or only motor?

  20. Watch Dogs Ps3 says:

    I’m impressed, I must say. Seldom do I come across a blog that’s equally educative and amusing, and let me tell you, you have
    hit the nail on the head. The issue is something too few people are speaking intelligently about.

    I am very happy I found this in my search for something concerning this.

  21. m.balagurunathan says:

    Differences between providing the MCC with and without the relays.

  22. john says:

    2. A final circuit consists of six heaters connected in parallel each having a resistance of 150Ω. Find (i) the total resistance of the circuit (ii) the current through each resistor if the supply voltage is 600 V.

  23. parikshit gorai says:

    thanks for your valuable notes regarding cable trays.

  24. Francis lungu says:

    what is maximum mega ohms on 11kv 3core cable

  25. sureshbabu says:

    good evening sir, what is genarators check list and genaral maitanance

  26. Appeagyei says:

    Hi Engineer Jignesh,

    I know loss of neutral on a 3 phase system causes voltage on phase with less load to rise and that of the phase with high load to fall. please explain how and why this happens

    Thank you

    • The absence of Neutral will cause the total voltage to rise upto 380V between 2 phases. So as per voltage dividing rule it acts as a serious combination of two parallel branches if without earth or neutral in between. Hence the serial branch which has more LOADS ( means effective resistance low because parallel connection ) will hae less voltage across it. Remember current is same.

  27. Danish says:

    hi jignesh
    can you help me out regarding , what we have to see or note the important points when we are reading the specification for the electrical equipment eg ..transformer, ups , fire alarm ,cctv, acess control , hv switchgear , busbar ,mdb ,smdb, etc can you please help me out on this
    regards
    and keep going

  28. RamKumar says:

    sir, How to do Hi-pot test (DC)

  29. Vinoth Kumar says:

    Thank You very much for this collection sir.. It helped me in my career.

  30. weljoe says:

    Jignesh,
    What is the acceptance resistance of low voltage cables?

  31. vidya says:

    Its a very good explanation..very clean nd clear. .soo great..thaank uu sir.

  32. Akif Qadeer says:

    How to choose Accuracy class of CT?
    Lets say Meter is of 0.5S or 0.5 accuracy!!

  33. bramhanand says:

    sir i want to know about the dynamic impedance of ht motor at the time of start

  34. Saiju Joseph says:

    Dear Jignesh.Parmar,

    How i calculate capacitor bank breaker (ampere) capacity ?..example 80kvar capacitor if i connect in MDB,

  35. Vishnu G says:

    I wants to know about different ferrules and its meaninga

  36. P M Pavan Kumar says:

    Dear Sir,
    When we connect the capacitor bank to the motor, will it draw current continuously or not? Please reply.

  37. Hlonie says:

    What causes inductance in a circuit

  38. c.b singh says:

    hello sir
    i have a question that if i have a sub station with a transformer capacity 5MVA i have to erect 3 feeder of 18 to 20 Km each then how can i select size of conductor. these feeder are for rural areas

  39. Amrit Kumar Mohanta says:

    Hello Sir,
    My question is regarding on power flow analysis. I want to know that, what is the X/R ratio of Grid. It is require for simulating in ETAP

  40. Pankaj tiwari.k says:

    Why motor ratings are in h.p not in kw?

  41. tony says:

    hae,i acknowledge the good work on this website..l am an electrical engineering graduate at diploma level however the job market is flooded.i would like to pursue plc programming studies to add value to my carreer path…at what degree will it enhance my chances in the job market?

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