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

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

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Power Systems
A CANDU reactor uses

 highly enriched uranium as fuel and water as moderator and coolant.
  natural uranium as fuel and heavy water as moderator and coolant.
 enriched uranium as fuel and ordinary water as moderator and cooler.
 only fertile materials.

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