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.
Start Practice Exam Test Questions
1. A coil and capacitor are connected in series. The inductive reactance is 250 Ω, and the capacitive reactance is -300 Ω. What is the net impedance vector, R + jX?
- A. 0 + j550.
- B. 0 - j50.
- C. 250 - j300
- D. -300 - j250.
2. A coil of 25.0 μH and capacitor of 100 pF are connected in series. The frequency is 5.00 MHz. What is the impedance vector, R + jX?
- A 0 + j467.
- B. 25 + j100.
- C. 0 - j467.
- D. 25 - j100.
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 Ω, a coil with reactance 100 Ω and a capacitor with reactance -200 Ω are connected in series. What is the complex impedance R + jX?
- A. 150 + j100.
- B. 150 - j200.
- C. 100 - j200.
- D. 150 - j100.
5. A resistor of 330 Ω, a coil of 1.00 μH and a capacitor of 200 pF are in series. What is R + jX at 10.0 MHz?
- A. 330 - j199.
- B. 300 + j201.
- C. 300 + j142.
- D. 330 - j16.8.
6. A coil has an inductance of 3.00 μH and a resistance of 10.0 Ω in its winding. A capacitor of 100 pF is in series with this coil. What is R + jX at 10.0 MHz?
- A. 10 + j3.00.
- B. 10 + j29.2.
- C. 10 - j97.
- D. 10 + j348.
7. A coil has a reactance of 4.00 Ω. What is the admittance vector, G + jB, assuming nothing else is in the circuit?
- A. 0 + j0.25.
- B. 0 + j4.00.
- C. 0 – j0.25.
- D. 0 + j4.00.
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 jBL = -j0.05 and jBC = j0.03. What is the admittance vector, assuming that nothing is in series or parallel with these components?
- A. 0 - j0.02.
- B. 0 - j0.07.
- C. 0 + j0.02.
- D. -0.05 - j0.03.
10. A coil, resistor, and capacitor are in parallel. The resistance is 1 Ω ; 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 + j0.
- B. 1 + jl.5.
- C. 1 - jl.5.
- D. 1 – j2.
11. A coil of 3.50 μH 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 + j0.00282.
- B. 0 – j0.00194.
- C. 0 + j0.00194.
- D. 0 – j0.00758.
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 + j0.024.
- B. 0.035 – j0.011.
- C. -0.011 - j0.035.
- D. 0.0044 + j0.046.
14. A resistor of 100 Ω, a coil of 4.50 μH, and a capacitor of 220 pF are in parallel. What is the admittance vector at 6.50 MHz?
- A. 100 + j0.00354.
- B. 0.010 + j0.00354.
- C. 100 – j0.0144.
- D. 0.010 + j0.0144.
15. The admittance for a circuit, G + jB, is 0.02 + j0.20. What is the impedance, R + jX?
- A. 50 + j5.0.
- B. 0.495 - j4.95.
- C. 50 - j5.0.
- D. 0.495 + j4.95.
16. A resistor of 51.0 Ω an inductor of 22.0 μH 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 - j14.9.
- B. 51.0 + j14.9.
- C. 46.2 - j14.9.
- D. 46.2 + j14.9.
17. A series circuit has 99.0 Ω of resistance and 88.0 Ω 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 Ω 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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