Power Systems
The VSWR of transmission line is

 Directly proportional to voltage minimum and inversely proportional to voltage maximum.
 Directly proportional to characteristic impedance and inversely to load impedance.
 Proportional to load and characteristic impedance.
  Directly proportional to load impedance and inversely to characteristic impedance.

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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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