1 .		Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by [Hint]   certain constant phase angles   certain constant frequencies   certain constant voltages   certain constant currents
2 .		The most common type of ac motor is the [Hint]   single-phase induction motor   two-phase induction motor   three-phase induction motor   two-phase squirrel-cage motor
3 .		A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is [Hint]   13.3 mA   133 mA   1.33 A   6.2 A
4 .		Referring to Problem 3, power consumption is [Hint]   16 W   160 mW   160 W   3,459 W
5 .		Referring to Problem 3, the total copper cross section must handle [Hint]   1.33 A   2.66 A   266 mA   26.6 mA
6 .		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? [Hint]   1.33 A   1.88 A   2.66 A   1.77 A
7 .		Referring to Problem 6, the total copper cross section must handle [Hint]   1.33 A   2.66 A   1.88 A   4.54 A
8 .		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? [Hint]   0 I   1.33 A   3.99 A   2.66 A
9 .		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 . [Hint]   single-phase 32 A; three-phase 16 A   single-phase 16 A; three-phase 8 A   single-phase 8 A; three-phase 4 A   single-phase 16 A; three-phase 0 A
10 .		A constant load power means a uniform conversion of [Hint]   mechanical to electrical energy   electrical to mechanical energy   current to voltage   voltage to current
11 .		In a three-phase system, the voltages are separated by [Hint]   45°   90°   120°   180°
12 .		In a three-phase system, when the loads are perfectly balanced, the neutral current is [Hint]   zero   one-third of maximum   two-thirds of maximum   at maximum
13 .		In a Y-connected circuit, the magnitude of each line current is [Hint]   one-third the phase current   three times the corresponding phase current   equal to the corresponding phase current   zero
14 .		In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of [Hint]   0°   30°   60°   120°
15 .		If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage? [Hint]   0 V   90 V   156 V   180 V
16 .		In a -connected generator, all of the phase voltages are [Hint]   zero   equal in magnitude   one-third of total   one-sixth of total
17 .		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? [Hint]   I θb = 12 150° A, I θc = 12-90° A   I θb = 12120° A, I θc = 1230° A   I θb = 1230° A, I θc = 12120° A   I θb = 1290° A, I θc = 1290° A
18 .		In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are [Hint]   2,000 V   6,000 V   666 V   3,464 V
19 .		Referring to Problem 18, if all phase currents are 3 A, the line current magnitudes are [Hint]   3 A   1 A   9 A   18 A
20 .		In a Y-Y source/load configuration, the [Hint]   phase current, the line current, and the load current are all equal in each phase   phase current, the line current, and the load current are 120° out of phase   phase current and the line current are in phase, and both are 120° out of phase with the load current   line current and the load current are in phase, and both are out of phase with the phase current
21 .		In a Y-connected source feeding a -connected load, [Hint]   each phase of the load has one-third of the full line voltage across it   each phase of the load has two-thirds of the full line voltage across it   each phase of the load has the full line voltage across it   each phase of the load has a voltage across it equal to
22 .		In a -connected source feeding a Y-connected load, [Hint]   each phase voltage equals the difference of the corresponding load voltages   each phase voltage equals the corresponding load voltage   each phase voltage is one-third the corresponding load voltage   each phase voltage is 60° out of phase with the corresponding load voltage
23 .		In a -connected source driving a -connected load, the [Hint]   load voltage and line voltage are one-third the source voltage for a given phase   load voltage and line voltage are two-thirds the source voltage for a given phase   load voltage and line voltage cancel for a given phase   load voltage, line voltage, and source phase voltage are all equal for a given phase
24 .		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 [Hint]   3 A   6 A   9 A   27 A
25 .		In a balanced three-phase load, each phase has [Hint]   an equal amount of power   one-third of total power   two-thirds of total power   a power consumption equal to