Power Systems
Recovery voltage in CB is equal to

  transient voltage.
  none of these.
  normal frequency 50 Hz rms voltage.
  arcing period voltage.

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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 centre 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

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