1)What will happen when 240 VDC supply is connected to 240VAC supply(DC supply +ve is connected to phase of AC supply & DC supply is to neutral of AC supply). 2)Also what will happen when 240 VDC supply is connected to 240 VAC supply in reverse polarity as of Sr. No 1.

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mention hazard experienced during installation

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Why the brushes used in dc machines are made of carbon not from other metal?

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Which device is provided as backup of Buchholz relay???

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what is the diff. b/w balanced and unbalanced load..?

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