Power Systems
For accurate load flow calculations on large power systems, the best method is

 G-S method
 N-R method
 Decoupled method
All of these

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Power Systems
A sodium graphite reactors use

  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as coolant.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as moderator.

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Power Systems
A CANDU reactor uses

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