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Phase – Gibilisco MCQs in Electronics

Multiple choice questions in Phase

This is the Multiple Choice Questions (MCQs) in Chapter 12: Phase from the book Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.

Start Practice Exam Test Questions

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.

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.
  • 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.

NOTE: For questions 15 see Fig.12-12.

Gibilisco MCQs image for CH12 Q15

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.

NOTE: For questions 16 – 20 see Fig.12-13.

Gibilisco MCQs image for CH12 Q15

16. Which of the drawings in Fig. 12-13 represents the situation of Fig. 12-13?

  • A. A.
  • B. B.
  • C. C.
  • D. D.

17. In vector diagrams such as those of Fig. 12-13, length of the vector represents:

  • A. Average amplitude.
  • B. Frequency.
  • C. Phase difference.
  • D. Peak amplitude.

18. In vector diagrams such as those of Fig. 12-13, the angle between two vectors represents:

  • A. Average amplitude.
  • B. Frequency.
  • C. Phase difference.
  • D. Peak amplitude.

19. In vector diagrams such as those of Fig. 12-13, the distance from the center of the graph represents:

  • A. Average amplitude.
  • B. Frequency.
  • C. Phase difference.
  • D. Peak amplitude.

20. In diagrams like those of Fig. 12-13, the progression of time is sometimes depicted as:

  • A. Movement to the right.
  • B. Movement to the left.
  • C. Rotation counterclockwise.
  • D. Rotation clockwise.

Complete List of Multiple Choice Questions from this Book

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