explain the meaning of harmonic resonance

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Logic using 1 kV or 1,1 kV grade in house wiring Low voltage cable. Explain/suggest? some use 1kV and some prefer 1.1kV grade insulation low voltage cable why??

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what happen ehen synchronisation is done at below rated speed

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Tell me the reason of connecting domestic t/f primary in star or delta,and also secondary side.

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how dia of wire and angles are calculated for overhead shielding wire to protect substation equipment from lightening strokes???

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tell how current tranfomer works

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Why we use three phase world wide why not four phase or five phase being used?

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highest rating of alternator used in india

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why distribution transformer are of DY11 type?

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why the transformer primary and secondary windins vector groups vary? why it is something like Dy11 and not as Dy or Yy...

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difference between local breaker backup relay or backup protection relay ?

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sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....

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