pls tell me about ups internal connection & we have given only 3 phase supply to ups system how get 4 wire (R Y B N )

0 Answers   Bhel, IBM,

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whatis the test procedure for lightning arrester which was installed one year back. i want check it whether it is working or not.

1 Answers  

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why does chattering take place in ac contactors? can it be avoided & what care does the manufacturer take to eliminate this phenomenon????

10 Answers  

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What Is Sampling?

0 Answers   Mahatma Gandhi University,

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how to diffrentiate between ac & dc motors from a distance

5 Answers  

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In dc motor starter there is less voltage required for holding contactor that's may why it is called no volt coil. but in ac starter why holding contactor is called no volt coil.

2 Answers   JSW,

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what will happen if the connections of protection ct reverse? will it burn the ct?

2 Answers  

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what is the range of maximum DOL and SDS can be use for pump and fan application

0 Answers  

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What are the disadvantges of leading power factor

5 Answers  

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Electromotive force is provided by:(a) Resistance’s(b) A conducting path(c) An electric current(d) An electrical supply source

2 Answers  

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what is the difference between ac motor and dc generator

0 Answers   ETA,

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What is meant by rating error prevention in breaker??

1 Answers   L&T,

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