Power Systems
A penstock is used as a condition between

 none of above.
  the dam and the turbine in a hydro station.
 the turbine and discharge drain.
 the heat ex-changer and the turbine in nuclear power plant.

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Power Systems
A CANDU reactor uses

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

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