Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / star.
 delta / delta.
 star / grounded star.
  ground star / delta.

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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.
  all of above.
 there is danger of radioactive contamination of steam.

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