what is the working process of over & under voltage relay.

0 Answers   NTPC,

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if transformer core is made of copper instead of steel which losses will increase..please explain

5 Answers   Bhel,

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difference between load bus and dead bus?

4 Answers  

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Air circuit breaker safety

0 Answers  

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why transformer are rated in KVA not in watt?

7 Answers   DMRC, L&T, TCS,

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1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

4 Answers   Havells,

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Why Drives are used to run AC motors?

3 Answers  

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when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is the return paht for the phase so the current of the neutral must be Ir+Ib+iY (return).But the size of the netural is .5 as comper to the phase.

2 Answers  

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The gauge indicates the number of amps, but what about voltage? How voltage rating (for wire or fuse) determined?

0 Answers  

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If a contactor need to replace with faulty one. what I want to check?

2 Answers   Bhel,

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What's voltage?

1 Answers   Pakistan Atomic Energy Commission PAEC,

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Why transformer rating is represent in KVA?

7 Answers   Bhel, Sonalika, Usha Martin, Wipro,

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