Answer / omar ashraf

Because In for Example Battery 120v , the + terminal voltage is 60 v and the - terminal is -60 v so the potential difference between its terminals is 60-(-60) =120 ,
When you measure the potential to ground so the + terminal is 60 and the other terminal is 0 so the potential difference is 60-0=60

Answer / k.prakashchandra

In case of bridge rectifier , the mid tap of the rectifier tr is earthed or two high resistances in series are connected across the charger out put terminals and the common point of the resistors is earthed . Hence the ground potential becomes (+ or -) zero

why induction motor having low power factor at starting time and high at full load.

6 Answers   BARC, HPB,

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Hi, Next week Iam appearing RRB exam for section engineer. So help me to get modal question papers for this position. Iam very thankful to you. Whether question will be fully techanical format or general form. Please give me a details regarding this exam.

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what is ratio of copper wire size and current ?

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I have a question, I visit 01 site and face a problem, there is 2.5 ton Air Con working, when air con compressor is running at that time rectifier voltages are increasing upto 290-295 v and rectifier is giving main high alarm (rectifier is APC single phase, before starting compressor rectifier voltages was 230v. when air con is going off rectifier voltages are decreasing smoothly at its actual voltages 230v. Load on Genset phases is this: Red-13.5 amp AC (Air Con load), Yellow-1.7 amp AC (BTS lights etc.) and Blew-4 amp AC (telecom system load), Genset phase to phase and neutral to phase voltages are also ok. These are 10 sites having same system and same rectifier APC brand at every site 02 genset are working but the problem is same at all these 10 sites. What will be the reason behind???

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