Answer Posted / arshit rajapara

isolator is one type of switch which is isolate system at a faulty condition as well as maintenance purpose and it placed before and after cb.

PLEASE TELL ME ABOUT QUESTION PAPER OF UPCL ENTERENCE EXAM.

7977

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we have 3 single phase transformers. how will we generate 6 supply from 3 phase supply input

2120

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If an electrical component has a positive temperature coefficient, how come such components have high power losses due to heat if current decreases when resistance increases? assuming power given by I^2*R whereby the Resistance is infinite.

1081

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What conditions are required for transformer to operate at low frequencies ?

2012

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one conductor length is L.and i am strech uniformly this conductor and made length is 2L.so resistance of this strech conductor is R=4R..but i want to know about area of stech conductor hows it become a/2..

2140

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What is line resistance of cable & how it can be measured ?

1522

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what maximum range of star & delta in hp or kw ?

1704

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What is the difference between electrical earthing and electrical grounding?

1155

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Is it good to short Neutral and Ground in the PLC or DCS main Power supply. Pls give YES or NO with reasons...? Simarpreet

2543

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What is use of starter and choke in tube light

1775

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how much LT load can bear by the 100 KW HT connection.

2223

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we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.

7123

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If there is major % of Voltage harmonics in the system, how can it be control or reduced?

1997

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how the B-H loop obtain under the static condition

2332

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What is the equivalent circuit of a transformer and its vector diagram?

2693

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