Power Systems
Non-commercial sources of energy are

None of these
 fossil fuel, hydro power and nuclear power.
 solar, wind and biomass.
  wood, animal wastes and agricultural wastes.

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Power Systems
In boiler water reactor (BWR)

 the feed water acts both coolant and a moderator.
  all of above.
 there is danger of radioactive contamination of steam.
 enriched uranium is used as fuel.

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