POWER SYSTEM MCQ

 MCQ-3-The skin effect shows that

 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 lower at the surface of the condutor

 current density is more at the surface of the condutor

ANS: current density is more at the surface of the condutor

HINT: 

Accumulation of current on the surface of the conductor is called skin effect. Due to skin effect the effective are of current flowing path is reduced causes increased resistance. i.e, AC resistance(Rac) is greater than DC resistance(Rdc). Approximately, Rac = 1.6 Rdc.