Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 200 MW
 800 MW
 1600 MW
 400 MW

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Power Systems
The skin effect shows that

 current density is lower 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
 current density is more at the surface of the condutor

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