Power Systems
A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

 33.33%
 25%
 66.66%
 75%

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

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