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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. As the size of the plates in a capacitor increases, all other things being equal: A. The value of XC increases negatively. B. The value of XC decreases negatively. C. The value of XC does not change. D. You can t say what happens to XC without more data. 2. If the dielectric material between the plates of a capacitor is changed, all other things being equal: A. The value of XC increases negatively.
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260 Capacitive reactance B. The value of XC decreases negatively. C. The value of XC does not change. D. You can t say what happens to XC without more data. 3. As the frequency of a wave gets lower, all other things being equal, the value of XC for a capacitor: A. Increases negatively. B. Decreases negatively. C. Does not change. D. Depends on the current. 4. A capacitor has a value of 330 pF. What is its capacitive reactance at a frequency of 800 kHz A. 1.66 . B. C. D. 0.00166 . 603 . 603 K .
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5. A capacitor has a reactance of A. 9.39 F. B. 93.9 F. C. 7.42 F. D. 74.2 F.
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6. A capacitor has a value of 47 F. Its reactance is frequency A. 72 Hz. B. 7.2 MHz. C. 0.000072 Hz. D. 7.2 Hz. 7. A capacitor has XC A. 2.18 F. B. 21.8 pF. C. 0.00218 F. D. 2.18 pF. 8800 at f
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47 . What is the 830 kHz. What is C 400 kHz. What is XC
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8. A capacitor has C 166 pF at f A. 2.4 K . B. 2.4 . C. 2.4 10 6 . D. 2.4 M .
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4.50 at 377 Hz. What is its capacitance
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Quiz 261 9. A capacitor has C A. 1.0 Hz. B. 10 Hz. C. 1.0 kHz. D. 10 kHz. 10. Each point in the RC plane: A. Corresponds to a unique inductance. B. Corresponds to a unique capacitance. C. Corresponds to a unique combination of resistance and capacitance. D. Corresponds to a unique combination of resistance and reactance. 11 If R increases in an RC circuit, but XC is always zero, then the vector in the RC plane will: A. Rotate clockwise. B. Rotate counterclockwise. C. Always point straight towards the right. D. Always point straight down. 12. If the resistance R increases in an RC circuit, but the capacitance and the frequency are nonzero and constant, then the vector in the RC plane will: A. Get longer and rotate clockwise. B. Get longer and rotate counterclockwise. C. Get shorter and rotate clockwise. D. Get shorter and rotate counterclockwise. 13. Each impedance R jXC: A. Represents a unique combination of resistance and capacitance. B. Represents a unique combination of resistance and reactance. C. Represents a unique combination of resistance and frequency. D. All of the above. 14. In an RC circuit, as the ratio of capacitive reactance to resistance, closer to zero, the phase angle: A. Gets closer to 90 degrees. B. Gets closer to 0 degrees. C. Stays the same. D. Cannot be found. 15. In a purely resistive circuit, the phase angle is: A. Increasing. B. Decreasing. XC/R, gets 4700 F and XC 33 . What is f
262 Capacitive reactance C. 0 degrees. D. 90 degrees. 16. If the ratio of XC/R is 1, the phase angle is: A. 0 degrees. B. 45 degrees. C. 90 degrees. D. Impossible to find; there s not enough data given. 17. In Fig. 14-13, the impedance shown is: A. 8.02 B. 323 C. 8.02 D. 323 j323. j8.02. j323. j8.02.
14-13 Illustration for quiz questions 17 and 18.
18. In Fig. 14-13, note that the R and XC scale divisions are not the same size. The phase angle is A. 1.42 degrees.
Quiz 263 B. About D. 60 degress, from the looks of it.
C. 58.9 degrees. 88.6 degrees. 19. An RC circuit consists of a 150-pF capacitor and a 330 resisitor in series. What is the phase angle at a frequency of 1.34 MHz A. 67.4 degrees. B. 22.6 degrees. C. 24.4 degrees. D. 65.6 degrees. 20. An RC circuit has a capitance of 0.015 F. The resistance is 52 . What is the phase angle at 90 kHz A. 24 degrees. B. 0.017 degrees. C. 66 degrees. D. None of the above.
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