Power Systems
A sodium graphite reactors use

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

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Power Systems
The advantage of hydro electric power station over thermal power station is

 hydro electric power station can supply the power throughout the year
 the initial cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required
 the operation cost of hydro electric power station is low

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