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single phase 230v three phase voltage 415volt why we aren't used line voltage 690v?

7 Answers   Citec,

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what is maxemo work permit procedure

0 Answers  

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How Can I calculate for the photometrics requirements for a street lighting? Data given are: 45 units of 6 meter light pole with 150 watts metal halide lamp, 220 volts and installed in a promenade area.

0 Answers  

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Do you know how to measure the earth resistance?

7 Answers   Manhattan,

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what is principle in relay testing kit?

3 Answers  

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is earthing is necessary if we use armoured cable

1 Answers   ABB, Schwing Stetter, Siemens,

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wheather the size of windings in motor and generator are the same

0 Answers  

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What is electrical diversity factor in electrical installations?

0 Answers  

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what happen if the secondry winding of the transformer is having less no of turns compare to the primery winding.

2 Answers  

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State thevenin’s theorem?

0 Answers  

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Since phi is the angular displacement between V & I, then why we use phi in power triangle ie. when showing active, reactive & apperent power in triangular manner & if it is ok then where is V & I in the triangle.

1 Answers  

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What is core balancing in Power Transformer. What is the affect of an unbalabce core.

1 Answers  

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