Power Systems
Resistance switching in normally employed in

 all breakers.
  air blast circuit breaker.
 bulk oil breakers.
 minimum oil breakers.

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Power Systems
The value of off diagonal elements is

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

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