Power Systems
Which of following generating plants has the minimum operating cost

 Nuclear plant.
 Diesel plant.
 Hydroelectric plant.
 Steam plant.

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Power Systems
A CANDU reactor uses

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

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