Answer Posted / murthy

for internal faults(incipiant faults) buch holz relaysare
used, over current relays also used in transformers

how can we change the polarity of Alternating current rapidly? how frequency of ac can be controlled and changed easily?

2015

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How many kinds of E.L.C.B and how to work E.L.C.B

2039

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Where voltage are high and current to be interrupted is low the breaker preferred is:

2284

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prove that power consumed in 3 phase delta system is 3 times as compared to 3 phase star system

2256

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What do you mean by pull of electromagnet?

1034

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11 kg trivevter meter has rating of -/5amps. And pt ratio11000/110v and is connected with 11kv ct/pt unit of cr ratio 75/5amps. And pt ratio of 11000/110v while checking accuracy of meter with HT Accuchek meter what value of PT ratio and CT ratio to be filled in Accuchek meter

1927

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What is the difference in calculating size of AC cables compared to calculating size of DC Cables? Usually DC Cables are larger than AC Cables although they have the same ampacity. Why is it?

1981

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Why a Permanent Magnet Generator has higher frequency as compared to frequency of main alternator?

1988

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why we testing the core balance of the transformer before comissioning?

2166

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how do prepare ongc exam.how is it question model.i am electrical. which part covering in electrical.tell me

2263

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Explain about how is it working Earth fault'relay and wahts the resistance value of earth bed

1534

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how brushed dc motor operating ?

1890

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please tell me, how i clear the objective test? when i studied form the one book after i solved the objective ,that time i solved that qes. but if i tried solve objective form the other book then i could not solved these que.

1675

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What is mean by spike arrester(Voltage Operated)

2064

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why 3 phase is converted into 2 phase using electronics circuit why not 2 phases are diresctly putted from the 3 phase transformer??

2186

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