Power Systems
Frequencies must be same in which of the following line to exchange the power from one place to other place ?

 both 1 and 2
 No need of same frequency for exchange of power
 Synchronous line
 Asynchronous line

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

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