Power Systems
In which of the following frequency control method tie line may be overloaded?

All of these
 parallel frequency
 flat frequency control
 flat tie line control

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Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus j
 sum of admittances connected at bus i
 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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