ECEN 459 Exam 2 questions and answers rated A+

ECEN 459 Exam 2 questions and
answers rated A+

The equivalent pi circuit is equal to the nominal pi circuit in terms of structure. - correct answer
✔✔ true



Typical power line lengths are only a small fraction of the 60 Hz wavelength. - correct answer
✔✔ true



The velocity of propagation of voltage and current waves along a lossless overhead line is the
same as the speed of light. - correct answer ✔✔ true



For a lossless line, at SIL, the voltage __________. - correct answer ✔✔ does not change



The theoretical steady-state stability limit for a lossless line between two buses is when the
angle difference between the two bus voltages is equal to - correct answer ✔✔ 90 degrees



The efficiency for an ideal transformer is slightly less than 100%. - correct answer ✔✔ false



For an ideal single-phase 2-winding transformer with a turn ratio a=n1/n2), an impedance (Z2)
connected across the secondary winding is referred to the primary winding by multiplying Z2 by
- correct answer ✔✔ a^2



Select all the losses considered in the equivalent circuit for a real transformer. - correct answer
✔✔ Eddy current loss

Hysteresis loss

Winding resistance loss