Answer Posted / francis

it a gatefull if I get answer thank u

when the time of backcharging the transformer three phases only enough or three phase with neutral is must.from these which one is the best one.

2043

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what transformer we used normally and upto which kva?

1950

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when it is possible kvrah lead & fundamental kwh be equal in electonic trivector meters (3 ph)

1996

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ACB & VCB how do work and saftes and how can maintenance in this and parts name show with picture

2107

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Compare jfet’s and mosfet’s.

1284

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What is the basic principle of welding process?

2148

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If a current -8+6sin6t is flowing three ammeter, one is a centre zero PMMC meter, one is true rms meter and one is moving iron meter. What are the reading of these three meter respectively?

2233

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some time we open engine breaker 8.0 MW load but plant not trip. and another time engine open 4.0 MW load engine trip why? individually engine breaker open & individually emergency stop why difference?

1764

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explain with diagram how to protect transformers and substations from over current with help of CT's?

1956

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How does a tertiary winding filter harmonic(espcially 3rd one) from entering into load system?

1807

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How to calculate the heat load for a electrical room

3085

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Explain difference between stand by earth fault and residual earth fault protection?

2014

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Why reactive power is needed in a power system? How is it being absorbed or delivered by alternators? For reactive power control we are changing excitation but reactive power absorbing or delivering related to stator. How these two are interlinked? i want a detailed explanation with necessary expressions and figures?

1914

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hi can any body send me syllabus of rrb electrical section engg... and past pepar also of any board...

2686

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I want to calculate how much capacitor we connect to maintain the unity power factor? Is there any formula? Pls give me the answer

1933

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