Why is the frequency not changed during transformation of electrical energy in a transformer?

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Can earth resistance be measured without connecting the earth electrode? and should earthing connections be disconnected What is the effect of connecting two cables of different sizes in parallel with supply? Thanks in Advance. I am intrested to get in touch with some tecnocrats/engineers,my mail i.d is : hiremathvijay@rediffmail.com

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what is meant by trivector meter?

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what is the current generated in a 230v megger?

2 Answers  

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what is meant by insulation voltage in cables? explain it?

4 Answers   ABB,

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Trafo ratio is 11kV/6.6kv,Vector group is YND11. What will be the effect if secondary is used for earthed system.

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Why we call cable rating in SQ.mm.If it is 240 SQ.mm how much the diameter possible?is there any calculation ?

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how to identify the cable quality and what is flame proof cable

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What are ampers.30kw motor.440volts.

5 Answers   Pam Glatt,

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What is the difference between in Fourier series and Fourier Transform. and please tell me the difference between both of them and the why we use them in communication system?

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What is the power ratio between power in Star and Delta circuit?

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what is auto transformer

3 Answers   IBM,

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