Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if the mutual couplings between transmission lines are absent
 if the shunt admittances at the buses are ignored
 always
 if both 2 and 3 are satisfied

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Power Systems
In boiler water reactor (BWR)

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

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