Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with reaction and adjustable vanes is

 Impeller.
 Francis.
  Kaplan.
 Pelton.

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Power Systems
In boiler water reactor (BWR)

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

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