Power Systems
MCB stands for

  molded circuit breaker.
  miniature circuit breaker.
  maximum capacity breaker.
  minimum capacity breaker.

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Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus i
 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus j

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