Actual power systems utilize three-phase AC system for long-distance power delivery. What is/are the significance of this network configuration? A Three sources require six conductors. Having more lines enables power companies to reach more consumers. B. it is an optimal and economical option for power delivery since it can carry three times the original power by just using three conductors. c. The voltage sources will have a secure and safe connection by connecting them either in wye or delta. D. All options are correct How can the single-phase equivalent circuit be derived from the three-phase network? A All options are necessary in deriving the single-phase equivalent circuit B. Connect the neutral point of all the wye connections c. Convert all delta-connected elements into wye. D. Draw the equivalent circuit that is composed of a voltage source, a line impedance, load impedances, and the imaginary line connecting all neutral points. In a single-phase equivalent circuit, the voltage source, load voltage, and the current must be expressed in: A. The source and load voltages are line-to-neutral values whereas the current is the line-to-line current 8. The source and load voltages are line-to-line values whereas the current is the line current c The source and load voltages are line-to-neutral values whereas the current is the line current. D. The voltages and current can either be line-to-neutral or line-to-line in the single-phase equivalent circuit. What does it mean when a three-phase AC system is "balanced"? A The sources and loads are both connected in wye B. The overall power factor of the network is unity c. The sources have equal magnitudes with angles that are 120 degrees apart from each other. The impedances of the loads are also equal. D. The three phases have equal number of loads. For a wye-connection: A The line-to-line (L-L) voltage leads the line-to-neutral (L-N) voltage by 30 degrees. The magnitude of the I-L voltage is sqrt(3) times the magnitude of the L-N voltage B. The line-to-line voltage has the same magnitude and angle as the line-to-neutral voltage. C. The line-to-line (L-L) voltage lags the line-to-neutral (L-N) voltage by 30 degrees. The magnitude of the L-L voltage is sqrt(3) times the magnitude of the L-N voltage. D. The line current lags the phase current by 30 degrees. The magnitude of the line current is sqrt(3) times the magnitude of the phase current For a delta connection: A. The line-to-line (L-L) voltage leads the phase voltage by 30 degrees. The magnitude of the L-L voltage is sqrt(3) times the magnitude of the phase voltage 8. The line-to-line voltage has the same magnitude and angle as the phase voltage. c. The line-to-line (L-L) voltage lags the phase voltage by 30 degrees. The magnitude of the L-L voltage is sqrt{3} times the magnitude of the phase voltage D. The line current has the same magnitude and angle as the phase current.