Amoung all classes of electric machines, why the transformer uses oil as one medium of cooling?

4 Answers  

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lightning arrester rating selection procedure: (line to line voltage(kV)/(squ.root of 3))*squ.root of 2. now the question is, IS this above formula correct for both STAR and DELTA connected system???

1 Answers  

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What is the role of Tertiary Winding in Transformer ?

2 Answers  

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what is Wave Trap? And its Function ? Detail? Where it is Used?

7 Answers  

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why neutral is required in electrical system

3 Answers   Bhel,

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what is principle of DC machines?

5 Answers   APTransco, NTPC, Wipro,

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what is the responsibilities of electrical project engineer?

2 Answers  

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If you don’t have coal, salt and copper, then how would you earth your connection temporarily at a camp site.?

0 Answers   Bajaj,

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Earth leakage relay basic knowledge principle

0 Answers   Radiant,

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what is the difference between ac and dc generator

14 Answers  

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HI SIR, AM PREPARING FOR RRB FOR SECTION ENGINEER POST. PLZ SEND ME THE PREVIOUS QUESTION PAPERS AND HELP ME. I HAVE NO ENOUGH TIME MY EXAM DATE IS 22ND JUNE.... MY EMAIL ID IS nalla.amarnath@gmail.com

0 Answers  

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i want to know how to calculate the battery capacity based on the UPS . ex i want to run have one kva UPS Which should run 10 hours ? in that case how many batteries to be installed and what will be the AH Value .

2 Answers  

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