Power Systems
Which of the following faults is/are treated as external faults?

 Over voltage
All of these
 Failure of prime mover of the generator
 Failure of excitation

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Power Systems
The value of off diagonal elements is

 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
 which is connected between bus i and bus j with positive sign

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