Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?

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What is “pu” in electrical engineering?

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how we control automatic generator i'e with to supply (main supply and local generator) when the main supply was break to supply the local supply automatically to begin supplying power.I now this control circuit is the combination of contactor time delay contactor switch and overload relay .but my question is how we combine those component thank you

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1.How to calculate backup time from series connected battery of 12v dc with 26Ah for 2battery?

3 Answers  

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what will happen if a 3 phase motor is connected to a single phase circuit and vice versa?

3 Answers  

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what are advantage and disadvantage of hvdc transmission . please tell us technic of hvdc technology

2 Answers  

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what are the reasons of low voltage during start the DG?

1 Answers   Godrej, Tata Power,

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in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

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why do we prefer alternating current in india where as in USA prefers DC?

3 Answers   Bhel, GMR, Texmo,

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Why Drives are used to run AC motors?

3 Answers  

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How the Transformer oil testing is done & Why oil dielectric goes LOW & what is solution for that ??

3 Answers   NTPC,

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How will you calaculate the Ct ratio based on connected load 500KVA,and 11KV supply ?

3 Answers  

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