Gibilisco - Phase
- 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.
Correct Answer
C. The electrons always flow in the same direction. -
- 2.
All sine waves
- A.
Have similar general appearance.
- B.
Have instantaneous rise and fall times.
- C.
Are in the same phase as cosine waves.
- D.
Rise instantly, but decay slowly.
Correct Answer
A. Have similar general appearance. -
- 3.
The derivative of a sine wave
- A.
Is shifted in phase by 1⁄2 cycle from the sine wave.
- B.
Is the rate of change in the instantaneous value.
- C.
Has instantaneous rise and decay times.
- D.
Rises instantly, but decays slowly.
Correct Answer
B. Is the rate of change in the instantaneous value. -
- 4.
A phase difference of 180° in the circular motion model of a sine wave represents
- A.
1⁄4 revolution.
- B.
1⁄2 revolution.
- C.
A full revolution.
- D.
Two full revolutions.
Correct Answer
B. 1⁄2 revolution. -
- 5.
You can add or subtract a certain number of degrees of phase to or from a wave, and end upwith exactly the same wave again. This number is
- A.
90, or any whole-number multiple of it.
- B.
180, or any whole-number multiple of it.
- C.
270, or any whole-number multiple of it.
- D.
360, or any whole-number multiple of it.
Correct Answer
D. 360, or any whole-number multiple of it. -
- 6.
You can add or subtract a certain number of degrees of phase to or from a sine wave, and endup with an inverted (upside-down) representation of the original. This number is
- A.
90, or any odd whole-number multiple of it.
- B.
180, or any odd whole-number multiple of it.
- C.
270, or any odd whole-number multiple of it.
- D.
360, or any odd whole-number multiple of it.
Correct Answer
B. 180, or any odd whole-number multiple of it. -
- 7.
Suppose a wave has a frequency of 300 kHz. How long does one complete cycle take?
- A.
1.300 s
- B.
0.00333 s
- C.
1/3000 s
- D.
3.33 × 10−6 s
Correct Answer
D. 3.33 × 10−6 s -
- 8.
If a wave has a frequency of 440 Hz, how long does it take for 10° of a cycle to occur?
- A.
0.00273 s
- B.
0.000273 s
- C.
0.0000631 s
- D.
0.00000631 s
Correct Answer
C. 0.0000631 s -
- 9.
Suppose two waves are in phase coincidence. One has peak values of 3 V and the other haspeak values of 5 V. The resultant has voltages of
- A.
+OR- 8 V pk, in phase with the composites.
- B.
+OR- 2 V pk, in phase with the composites.
- C.
+OR- 8 V pk, in phase opposition with respect to the composites.
- D.
+OR- 2 V pk, in phase opposition with respect to the composites.
Correct Answer
A. +OR- 8 V pk, in phase with the composites. -
- 10.
Shifting the phase of an ac sine wave by 90° 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.
Correct Answer
B. Moving it to the right or left by 1⁄4 cycle. -
- 11.
Two pure sine waves that differ in phase by 180° can be considered to
- A.
Be offset by two full cycles.
- B.
Be in phase opposition.
- C.
Be separated by less than 1⁄4 cycle.
- D.
Have a frequency of 1⁄2 cycle.
Correct Answer
B. Be in phase opposition. -
- 12.
Suppose two sine waves are in phase opposition. Wave X has a peak amplitude of 4 V andwave Y has a peak amplitude of 8 V. The resultant has voltages of
- A.
+OR- 4 V pk, in phase with the composites.
- B.
+OR- 4 V pk, out of phase with the composites.
- C.
+OR- 4 V pk, in phase with wave X.
- D.
+OR- 4 V pk, in phase with wave Y.
Correct Answer
D. +OR- 4 V pk, in phase with wave Y. -
- 13.
If wave X leads wave Y by 45°, 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.
Correct Answer
C. Wave Y is 1⁄8 cycle behind wave X. -
- 14.
If wave X lags wave Y by 1⁄3 cycle, then
- A.
Wave Y is 120° ahead of wave X.
- B.
Wave Y is 90° ahead of wave X.
- C.
Wave Y is 60° ahead of wave X.
- D.
Wave Y is 30° ahead of wave X.
Correct Answer
A. Wave Y is 120° ahead of wave X. -
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Jan 21, 2013Quiz Edited by
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Dec 13, 2010Quiz Created by
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