6. A technician uses an oscilloscope to measure the peak value of an AC wave. He tells you that the voltage has a peak value of 100 V. What is the rms value of the voltage?
A. 100 V
B. 10 V
C. 707 V
D. 70.7 V
7. How long does it take one cycle of 60 Hz current to complete one positive and one negative alternation?
A. 1/120 second
B. 1/180 second
C. 1/60 second
D. 1/360 second
8. The peak value of a sine wave is 80 VAC. What is the peak-to-peak value of this waveform?
A. 60 V
B. 160 V
C. 120 V
D. 40 V
9. The peak value of a sine wave is equal to 240 VAC. What is the average value of the waveform?
A. 169.68 V
B. 152.64 V
C. 120.74 V
D. 144.14 V
10. The average value of a sine wave is 83 VAC. What is the peak value (rounded) of the sine wave?
A. 110.9 V
B. 145.2 V
C. 115.6 V
D. 130.5 V
11. At what voltage level is AC power normally created by the utility?
A. 1000 VAC
B. 2500 VAC
C. 500 VAC
D. 1300 VAC
12. In a modern industrial plant, the most likely polyphase power system in use is a
A. one-phase system.
B. two-phase system.
C. four-phase system.
D. three-phase system.