Atwhat condition reverse power relay will act?

0 Answers   Equate,

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Why do we apply both Differential and REF (HV and LV) protection schemes on YNyn configuration of a transformer?

0 Answers   WCC,

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what is difference between ac1 and ac3 contactor and why it is needed to be selected?

1 Answers  

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Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . please reply..............

9 Answers   NTPC,

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in the case of 6.6kv motor starter combination contain fuses on it VCB. but in 11KV motor starter combination Fuses are not using in it's VCB why?

0 Answers  

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all interview questions with answers of ntpc (2000-2009

0 Answers   Hetero, NTPC,

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The series field winding has low resistance while the shunt field winding has high resistance. Why?

0 Answers  

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What is accuracy of a measurement?

0 Answers  

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Pls tell me whether we can use EN3A material for shafts of Permanent magnet alternator.What will be the effect of magnetic and nonmagnetic material for shafts on magnetic properties of PM rotor .

0 Answers  

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What is Isolation Transformer???

4 Answers   Emerson,

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what is timing for mccb 800A tripping?

1 Answers   L&T,

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how to calculate bus-bar sizes? (copper bus-bars)

2 Answers  

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