Power Systems
Nuclear fission means

  moderator.
  combination of two light nuclei.
  graphite.
  breaking up of nuclear of heavy atoms into nearly equal parts.

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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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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in same units
 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in same units
 base value of quantity /actual value of quantity in different units

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