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

42 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,

  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
    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:

    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

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