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Refer to the text in this chapter if necessary. A good score is 18 correct. Answers are in the back of the book. 1. Which of the following is not a general characteristic of an ac wave A. The wave shape is identical for each cycle. B. The polarity reverses periodically. C. The electrons always flow in the same direction. D. There is a definite frequency. 2. A sine wave: A. Always has the same general appearance. B. Has instantaneous rise and fall times. C. Is in the same phase as a cosine wave. D. Rises very fast, but decays slowly. 3. The derivative of a sine wave: A. Is shifted in phase by 1 2 cycle from the sine wave. B. Is a representation of the rate of change. C. Has instantaneous rise and fall times. D. Rises very fast, but decays slowly. 4. A phase difference of 180 degrees in the circular model represents: A. 1/4 revolution. B. 1/2 revolution. C. A full revolution. D. Two full revolutions. 5. You can add or subtract a certain number of degrees of phase to or from a wave, and end up with exactly the same wave again. This number is: A. 90. B. 180. C. 270. D. 360. 6. You can add or subtract a certain number of degrees of phase to or from a sine wave, and end up with an inverted (upside-down) representation of the original. This number is: A. 90. B. 180. C. 270. D. 360.
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Quiz 227 7. A wave has a frequency of 300 kHz. One complete cycle takes: A. 1 300 second. B. 0.00333 second. C. 1 3,000 second. D. 0.00000333 second. 8. If a wave has a frequency of 440 Hz, how long does it take for 10 degrees of phase A. 0.00273 second. B. 0.000273 second. C. 0.0000631 second. D. 0.00000631 second. 9. Two waves are in phase coincidence. One has a peak value of 3 V and the other a peak value of 5 V. The resultant will be: A. 8 V peak, in phase with the composites. B. 2 V peak, in phase with the composites. C. 8 V peak, in phase opposition with respect to the composites. D. 2 V peak, in phase opposition with respect to the composites. 10. Shifting the phase of an ac sine wave by 90 degrees is the same thing as: A. Moving it to the right or left by a full cycle. B. Moving it to the right or left by 1 4 cycle. C. Turning it upside-down. D. Leaving it alone. 11. A phase difference of 540 degrees would more often be spoken of as: A. An offset of more than one cycle. B. Phase opposition. C. A cycle and a half. D. 1.5 Hz. 12. Two sine waves are in phase opposition. Wave X has a peak amplitude of 4 V and wave Y has a peak amplitude of 8 V. The resultant has a peak amplitude of: A. 4 V, in phase with the composites. B. 4 V, out of phase with the composites. C. 4 V, in phase with wave X. D. 4 V, in phase with wave Y. 13. If wave X leads wave Y by 45 degrees of phase, then: A. Wave Y is 1 4 cycle ahead of wave X.
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228 Phase B. Wave Y is 1 4 cycle behind wave X. C. Wave Y is 1 8 cycle behind wave X. D. Wave Y is 1 16 cycle ahead of wave X. 14. If wave X lags wave Y by 1 3 cycle, then: A. Y is 120 degrees earlier than X. B. Y is 90 degrees earlier than X. C. Y is 60 degrees earlier than X. D. Y is 30 degrees earlier than X. 15. In the drawing of Fig. 12-12: A. X lags Y by 45 degrees. B. X leads Y by 45 degrees. C. X lags Y by 135 degrees. D. X leads Y by 135 degrees.
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