6. A technician uses an oscilloscope to measure the peak value of an AC wave. He tells you that the       voltage...

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.