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

3 Answers   NTPC,

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What are the uses of stepper motor?

0 Answers  

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PID controller details

1 Answers  

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what does a k rating in a transformer means?

0 Answers  

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all details of DG UPS HVAC

0 Answers  

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what is the name of the oil is used in transformer?

5 Answers  

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sir plz send some previous year questions of jspl.

0 Answers  

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1. Why is the speed of shunt motor practically constant? 2. Why dc series motor use to start with heavy loads? 3. advantages & disadvantages of separately excited generator over self excited generator?

0 Answers  

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A 100 kVA , 400 v/250 kv testing transformer has 8% leakage reactance and resistance on 100 KVA base . A cable has to be tested at 500 kv using the above transformer as a resonant transformer at 50 hz . if the charging current of the cable at 500 kv is 0.4 A find the series inductance required . Assume 2% resistance for the inductor to be used and the connecting leads . Neglect dielectric loss of hte cable . what will be the input voltage to the transformer ?

0 Answers   L&T,

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I have a transformer whose primary operates at 230V, 50Hz for which the secondary voltage will be 12V, 50Hz. What will be the secondary voltage if the primary is fed with 400V, 8KHZ Signal?

6 Answers   ABB,

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What is the main purpose of relay?

1 Answers  

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what is use of mccb.

1 Answers   Simplex,

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