Power Systems
Gas turbine power plants for maximum efficient may have

 Heat exchangers.
 Reheating.
  All of above.
 Multistage compression.

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

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Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus j
 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus i

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