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 is core balancing in Power Transformer. What is the affect of an unbalabce core.

1 Answers  

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what is power factor ? why is it so important?

2 Answers   Telco,

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what happens when reactive power increases ? does the reactive power loss increase or decrease ?

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I am looking for LV CT test. To check the polarity of the CT only. Can you suggest any supplier. Different companies are offering CT/PT Tester which is expensive. Thanks

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Which type of a.c motor is used in the fan (ceiling fan, exhaust fan, pedestal fan, bracket fan etc) which are find in the houses ?

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what are the different type of transformers available in markets???

6 Answers   Atomic Energy Commission,

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What is encoder, how it function

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i have a roll dia aprox.43 inches and gear box ratio is 14.3.so my question is how was decide the kw rating of motor.

1 Answers  

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What is the difference between relays and contactor construction wise?

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Tell me harmfull effects of over voltage,under voltage,spike,surge,transient & noise.

1 Answers  

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