Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.60
 0.0030
 0.30
 0.0060

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus i
 sum of admittances connected at bus j

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