Power Systems
In boiler water reactor (BWR)

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

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Power Systems
The draft tube is provided to

None of these
 raise the water surface of the stream to create an artificial head.
  increase the acting head on the water wheel.
 reduce the effect of water hammer.

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