Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

 2.63 msec
 1.47 msec
 4.68 msec
 9.68 msec

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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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