This is the Multiple Choice Questions (MCQs) in Chapter 16: RLC and GLC Circuit Analysis 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.

### Begin the Test

1. A coil and capacitor are connected in series. The inductive reactance is 250 Î©, and the capacitive reactance is -300 Î©. What is the net impedance vector, *R *+ *jX*?

- A. 0 +
*j*550. - B. 0 -
*j*50. - C. 250 -
*j*300 - D. -300 -
*j*250.

2. A coil of 25.0 Î¼H and capacitor of 100 pF are connected in series. The frequency is 5.00 MHz. What is the impedance vector, *R *+ *jX*?

- A 0 +
*j*467. - B. 25 +
*j*100. - C. 0 -
*j*467. - D. 25 -
*j*100.

3. When *R *= 0 in a series RLC circuit, but the net reactance is not zero, the impedance vector:

- A. Always points straight up.
- B. Always points straight down.
- C. Always points straight towards the right.
- D. None of the above.

4. A resistor of 150 Î©, a coil with reactance 100 Î© and a capacitor with reactance -200 Î© are connected in series. What is the complex impedance *R *+ *jX*?

- A. 150 +
*j*100. - B. 150 -
*j*200. - C. 100 -
*j*200. - D. 150 -
*j*100.

5. A resistor of 330 Î©, a coil of 1.00 Î¼H and a capacitor of 200 pF are in series. What is *R *+ *jX *at 10.0 MHz?

- A. 330 -
*j*199. - B. 300 +
*j*201. - C. 300 +
*j*142. - D. 330 -
*j*16.8.

6. A coil has an inductance of 3.00 Î¼H and a resistance of 10.0 Î© in its winding. A capacitor of 100 pF is in series with this coil. What is *R *+ *jX *at 10.0 MHz?

- A. 10 +
*j*3.00. - B. 10 +
*j*29.2. - C. 10 -
*j*97. - D. 10 +
*j*348.

7. A coil has a reactance of 4.00 Î©. What is the admittance vector, *G *+ *jB, *assuming nothing else is in the circuit?

- A. 0 +
*j*0.25. - B. 0 +
*j*4.00. - C. 0 –
*j*0.25. - D. 0 +
*j*4.00.

8. What will happen to the susceptance of a capacitor if the frequency is doubled, all other things being equal?

- A. It will decrease to half its former value.
- B. It will not change.
- C. It will double.
- D. It will quadruple.

9. A coil and capacitor are in parallel, with *jB*L = -*j*0.05 and *jB*C = *j*0.03. What is the admittance vector, assuming that nothing is in series or parallel with these components?

- A. 0 -
*j*0.02. - B. 0 -
*j*0.07. - C. 0 +
*j*0.02. - D. -0.05 -
*j*0.03.

10. A coil, resistor, and capacitor are in parallel. The resistance is 1 Î© ; the capacitive susceptance is 1.0 siemens; the inductive susceptance is -1.0 siemens. Then the frequency is cut to half its former value. What will be the admittance vector, *G *+ *jB*, at the new frequency?

- A. 1 +
*j*0. - B. 1 +
*j*l.5. - C. 1 -
*j*l.5. - D. 1 –
*j*2.

11. A coil of 3.50 Î¼H and a capacitor of 47.0 pF are in parallel. The frequency is 9.55 MHz. There is nothing else in series or parallel with these components. What is the admittance vector?

- A. 0 +
*j*0.00282. - B. 0 –
*j*0.00194. - C. 0 +
*j*0.00194. - D. 0 –
*j*0.00758.

12. A vector pointing “southeast” in the GB plane would indicate the following:

- A. Pure conductance, zero susceptance.
- B. Conductance and inductive susceptance.
- C. Conductance and capacitive susceptance.
- D. Pure susceptance, zero conductance.

13. A resistor of 0.0044 siemens, a capacitor whose susceptance is 0.035 Siemens, and a coil whose susceptance is -0.011 siemens are all connected in parallel. The admittance vector is:

- A. 0.0044 +
*j*0.024. - B. 0.035 –
*j*0.011. - C. -0.011 -
*j*0.035. - D. 0.0044 +
*j*0.046.

14. A resistor of 100 Î©, a coil of 4.50 Î¼H, and a capacitor of 220 pF are in parallel. What is the admittance vector at 6.50 MHz?

- A. 100 +
*j*0.00354. - B. 0.010 +
*j*0.00354. - C. 100 –
*j*0.0144. - D. 0.010 +
*j*0.0144.

15. The admittance for a circuit, *G *+ *jB*, is 0.02 + *j*0.20. What is the impedance, R + *jX*?

- A. 50 +
*j*5.0. - B. 0.495 -
*j*4.95. - C. 50 -
*j*5.0. - D. 0.495 +
*j*4.95.

16. A resistor of 51.0 Î© an inductor of 22.0 Î¼H and a capacitor of 150 pF are in parallel. The frequency is 1.00 MHz. What is the complex impedance, *R *+ *jX*?

- A. 51.0 -
*j*14.9. - B. 51.0 +
*j*14.9. - C. 46.2 -
*j*14.9. - D. 46.2 +
*j*14.9.

17. A series circuit has 99.0 Î© of resistance and 88.0 Î© of inductive reactance. An ac RMS voltage of 117 V is applied to this series network. What is the current?

- A. 1.18 A.
- B. 1.13 A.
- C. 0.886 A.
- D. 0.846 A.

18. What is the voltage across the reactance in the above example?

- A. 78.0 V.
- B. 55.1 V.
- C. 99.4 V.
- D. 74.4 V.

19. A parallel circuit has 10 ohms of resistance and 15 Î© of reactance. An ac RMS voltage of 20 V is applied across it. What is the total current?

- A. 2.00 A.
- B. 2.40 A.
- C. 1.33 A.
- D. 0.800 A.

20. What is the current through the resistance in the above example?

- A. 2.00 A.
- B. 2.40 A.
- C. 1.33 A.
- D. 0.800 A.

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