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

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Power Systems
Critical mass is

 maximum mass of fissionable material required to sustain a chain reaction.
 a mass of fissionable material required to stop a chain reaction.
  minimum mass of fissionable material required to sustain chain reaction.
 none of these.

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