Power Systems
When a neutral point of 3 - Φ system is directly connected to earth then it has what type of grounding?

  Resistance.
  Solid.
  Reactance.
  Peterson coil.

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Power Systems
A sodium graphite reactors use

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

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