Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is cheaper and lighter
 it is more conductive
 costlier
 its tensile strength is more

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Power Systems
In boiler water reactor (BWR)

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

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