Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0.5
 0 leading
 unity
 0.707 leading

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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.
 only fertile materials.
 enriched uranium as fuel and ordinary water as moderator and cooler.

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