how can we understand that where we have to use ac or dc coil for solenoid valve and why?what is the different between coil of ac and dc explain please.

0 Answers   TK Group,

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present we are having 0.8pf but I want increase it up to 0.99 so what is the formula for it and how can i calculate?

3 Answers   ABB,

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Is possible to increase the voltage without using transformer? why?

9 Answers  

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how to calculate voltage drop in long distance cable? for an e.g lamp of 12 volt ac ,300watt is 90 meter away from supply i.e (x'mer 230 v / 12v)and i m getting 8 volts at lamp terminal ....

1 Answers  

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what is the function of garing capacitir in SF6 circuit braker?

1 Answers  

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What is the effect of earth capacitance

3 Answers  

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at what condition restricted earth fault relay will act?

1 Answers   Equate,

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I have tow 200 KVA UPS, both are in parallel mode.My question is that, both are running on battery when power fail, if one of them fail (Eg rectifire fails or some other reason), at thet time reverse power will come to faild ups if it comes then it will harm to failed ups or not? if not then how it protects to faied ups????????????????

1 Answers  

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expansion of rccb

2 Answers   Videocon,

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WHY SPEAKER OUTPUT IN WATTS??

2 Answers  

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Why motor initial starting current is high?

9 Answers   Pennar,

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what is formula to cal cute earth pit numbers and size of earth strip used in earthing?

0 Answers  

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