Power Systems
Critical visual voltage is the voltage at which

 both 1 and 2
 corona is just initiated
 corona is visible with blue or violet colour
None of these

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Power Systems
In boiler water reactor (BWR)

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

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