Power Systems
In which power plant, the thermal efficiency is quite low

  Nuclear power plant.
  Steam power plant.
  Diesel power plant.
  Hydro power plant.

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Power Systems
A sodium graphite reactors use

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

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Power Systems
An impulse turbine

  operates by initial complete conversion to kinetic energy.
 makes use of a draft tube.
 is most suited for low head and high discharge power plants.
 always operates submerged.

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