Power Systems
In a transmission line the insulators to be used at the dead end or sharp curves are

 suspension type
 any of the above
 pin type insulator
 strain type

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

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