Power Systems
String efficiency depends upon

 voltage rating of whole string.
 no. of SCR in the string.
 voltage rating of one SCR.
  all of these.

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Power Systems
The value of off diagonal elements is

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

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