Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 3.535 pu
 5 pu
 5.353 pu
 7 pu

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

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