Power Systems
In a three-phase system, when the loads are perfectly balanced, the neutral current is

  one - third of minimum.
  zero.
  two - thirds of maximum.
  one - third of maximum.

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Power Systems
In hydroelectric power plants

  operating cost is low and initial cost is high.
 both operating and initial cost are high.
 operating cost is high and initial cost is low.
 both operating and initial cost are low.

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