Power Systems
String efficiency depends upon

  all of these.
 voltage rating of one SCR.
 voltage rating of whole string.
 no. of SCR in the string.

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Power Systems
A CANDU reactor uses

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

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