Power Systems
String chart is drawn between

 nether 1 nor 2
 T on Y-axis and S and T on on X-axis
 temperature (T) on X- axis, sag(S) and tension (T) on Y-axis
 both 1 and 2

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 always
 if both 2 and 3 are satisfied
 if the mutual couplings between transmission lines are absent
 if the shunt admittances at the buses are ignored

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