Power Systems
The Gauss Seidel load flow method has following disadvantages. Which of the following statement is wrong?

 Slow convergence
 A good initial guess for voltages is essential for convergence
 Unreliable convergence
 Choice of slack bus affects the convergence

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Power Systems
Critical mass is

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

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