Power Systems
In a Gauss Seidel load flow method, the number of iterations may be reduced if the correction in voltage at each bus is multiplied by

 Gauss constant
 Blocking factor
 Acceleration factor
 Lagrange multiplier

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Power Systems
The skin effect shows that

 current density is lower at the surface of the condutor
 current density is more at the surface of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is more at the centre of the condutor

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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

 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
 always

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