Power Systems
A sodium graphite reactors use

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

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Power Systems
Which of the following is/are the advantages of synchronous phase modifier over the shunt compensation?

 initial cost is low
 smooth voltage regulation is possible by controlling excitation
 both 1 and 2
 single unit can be used as both capacitance and inductor by adjusting the excitation

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