Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 Asynchronous line
 both 1 and 2
 Synchronous line
 No need of same frequency for exchange of power

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Power Systems
In boiler water reactor (BWR)

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

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