If single phase supply is 220v. then why three phase supply is 660?

2 Answers  

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What is the basic difference between directional and non directional over current protection?

1 Answers  

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why we are using earth pit in sub stations.?

0 Answers  

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can anyone send me some sample question regarding power grid corp

0 Answers  

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What are the types of piano switches?

0 Answers  

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how we can calculate earth fault current?

1 Answers   Alchemist,

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whether the generating voltage can be made to be transmitted by means of signals to the recieved end or at the consumers end?

6 Answers   TCS,

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Do inductive loads have distorted current waveforms ?

0 Answers  

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If Two Generators are working parellel in a network and suddenly the field of one Generator get weakened What will happened if there is no reverse power relay fixed in that Generator panel????

7 Answers  

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what is R Core Transformer. how it differs from normal transformers. dont search in net and post the answer.

0 Answers  

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What is difference is of VSD,VFD,VSDS, are they the same as the direct current to control dc using above mention

0 Answers  

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working of bulb?

1 Answers  

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