Power Systems
Operator "a" rotates a vector

 anti clock wise direction
 nether 1 nor 2
 clock wise direction
 either 1 or 2

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Power Systems
In boiler water reactor (BWR)

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

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