Why -48V dc power supply using in telecom field?

7 Answers   APC, Cisco,

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a induction motar has 30-35% exciting current at no load but in transformer it is only 2-3% ofbrated current why any reason?

1 Answers   century,

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What would cause a 240v choke that should give 110v out on a 16w lamp to gradually increase to 160v?

0 Answers  

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what is the difference between series and shunt compensation using facts in a transmission line

8 Answers   College School Exams Tests, Genco,

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how can testing using megger?

1 Answers  

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Differenc between the resistance and resisters?

5 Answers  

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why autotransformers are not safe for supplying low voltage from a high voltage source?

5 Answers  

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what is the formula for transformer oil?

1 Answers  

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how you can select circuit breaker for 2000kva transformer?

9 Answers   TATA,

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I have two power supply.a)govt. power b)Captive power.3 phase load connected inside factory.when source change govt. source to captive some motor rotate reverse. Is phase sequence changes when if off & on?If I off generator & on it again is it possible to get changed phase sequence??

4 Answers   ABB,

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what will happen if the frequency supplied is more than the frequency of the instrument...?

3 Answers  

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what is the function of Droop CT and where it is used?

3 Answers   Lanco,

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