2. In a Y-connected circuit, the magnitude of each line current is
3. A constant load power means a uniform conversion of
4. A two-phase generator is connected to two 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
5. A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is
6. A three-phase generator is connected to three 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
7. Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 .
8. If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?
9. Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by
10. In a balanced three-phase load, each phase has
11. In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is
12. A three-phase -connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I θa = 12 30° A, what are the polar expressions for the other phase currents?
13. In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
14. The most common type of ac motor is the
15. In a Y-connected source feeding a -connected load,
16. In a -connected generator, all of the phase voltages are
17. In a -connected generator, there is a 120° difference between each line current and the nearest phase current.
18. Power is measured in a three-phase load by using an ammeter.
19. Polyphase is characterized by two or more sinusoidal voltages, each having a different phase angle.
20. In a Y-connected generator, there is a 120° difference between each line voltage and the nearest phase voltage.
21. A simple three-phase generator consists of three conductive loops separated by 120°.
22. A balanced load is one in which all the impedances are equal.
23. The term squirrel-cage applies to a type of three-phase ac generator.
24. A simple two-phase generator consists of two conductive loops separated by 90°, rotating in a magnetic field.
25. An alternator is an electromechanical ac generator.