What is the effect if power factor is above 1 or unity.

15 Answers   NTS,

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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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what will happen if dc machine are supplied by ac source??

2 Answers  

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WHAT IS RMU AND WHAT IS ITS FUNCTION AND HOW TODISCONNECT

3 Answers   Bhel,

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In CT's they mentioned 400/5 or 1250/5, 1000/1 here 400,1250,1000 is Breaker Capacity what is the /5 Explain me briefly

2 Answers  

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two phases with neutral supply can be taken in 3C X 10 sq.mm cable .

0 Answers   SPCL,

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

0 Answers   Jomel,

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what is TPN

5 Answers  

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i have some screw comprressor with 630kw power,i have established them with simple star to delta circuit,by the way there is so much inertia when the screw comprressors start, can you offer me contactors power with 400vac or any cataluge to choose the contactors

0 Answers  

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what is frequency response?

0 Answers  

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how a vibration switch's high signal will going to trip the motor? can u explain with some examplesand wiring diagrams?

1 Answers   Bhel, Wartsila,

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how we can produce negative DC voltage ? please explain it .,thank u

1 Answers  

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