Power Systems
Due to proximity effect, the increase in conductor resistance is not negligible in

All of these
 overhead transmission lines
 communication lines
 underground cable

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Power Systems
A CANDU reactor uses

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

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