Power Systems
Steady state stability of a power system is improved by

 decreasing generator inertia
All of these
 single pole switching
 using double circuit line instead of single circuit line

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Power Systems
The skin effect shows that

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

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