what is the mechanism of operation of brushless dc motor why is it more wexpensive then ordinary permanent magnet motors

0 Answers   Lanco,

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what are the points to be consider for MCB(miniature circuit breaker selection?

3 Answers  

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what is the reason for balance of voltage in magnetic balance test?

2 Answers   Reliance,

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What is power factor ?What are the benefits of improved power factor & how. Please explain with examples.?

5 Answers   ABB,

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What is mean by Power factor

5 Answers   Fenner,

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According to ohms law voltage proportional to current, then why should current rating is low with high voltage rating in transformer?

5 Answers   KEC,

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Any one can explain if there is any harm from humming noise heard from air circuit breaker : we have 415 switch board having two incomers from transformers 3.3KV/415V , when bus coupler closed, and open one ACB incomer to work in one of the transformers, the current started hunting around 50 Amps, and heard humming noise from the air circuit breaker, although the load current was only 1200 amps while the ACB capacity is 2500 Amps, and the transformer 1600 KVA. The same didn't happen when taken the other transformer offline. Why this humming noise and current fluctuation? is there any implication or danger, bearing in mind that we just returned everything back to normal and stopped the maintenance of the transformer. Shall we go ahead and ignore this noise?

6 Answers  

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Anybody now how to claculate the Bescom power consumption?

1 Answers  

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Why don't we provide SURGE ARRESTORS for Transformer feeders?

5 Answers  

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what is the formula of knowing the clabe size on any load?

1 Answers   JSW, Scan Steel,

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We have 90mX100m hangar with 16 no.of supporting pillar. It is required to provide power supply on all pillars. what is suggested earthing scheme for hangars.

0 Answers   HAL,

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Why the efficiency of generator is more than motor in swinburne's test

0 Answers  

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