RLC Circuits and Resonance problems
- 1. A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
Options- A. increase
- B. remain the same
- C. decrease
- D. be less selective Discuss
Correct Answer: decrease
- 2. A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance
Options- A. is 230 Ω
- B. is 170 Ω
- C. is 200 Ω
- D. cannot be determined Discuss
Correct Answer: is 200 Ω
- 3. Referring to Problem 20, what is the total parallel resistance (Rp(tot))?
Options- A. 4.99 Ω
- B. 499 Ω
- C. 4,992 Ω
- D. 6,800 Ω Discuss
Correct Answer: 4,992 Ω
- 4. A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is
Options- A. 7 kHz
- B. 13 kHz
- C. 20 kHz
- D. 6 kHz Discuss
Correct Answer: 6 kHz
- 5. A resistor of 3 kΩ, a 0.05 µF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?
Options- A. 636 Ω
- B. 3,769 Ω
- C. 433 Ω
- D. 4,337 Ω Discuss
Correct Answer: 4,337 Ω
- 6. A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
Options- A. 12.7 Ω
- B. 127 Ω
- C. 4,436 Ω
- D. 6,174 Ω Discuss
Correct Answer: 12.7 Ω
- 7. A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is
Options- A. 9 mA
- B. 90 mA
- C. 13 mA
- D. 130 mA Discuss
Correct Answer: 130 mA
- 8. A 9 mH coil is in parallel with a 0.015 µF capacitor across an 18 kHz ac source. The coil's internal resistance, RW, is 60 Ω. The circuit impedance is
Options- A. 17,340 Ω
- B. 1,734 Ω
- C. 290 Ω
- D. 1,018 Ω Discuss
Correct Answer: 17,340 Ω
- 9. A 15 Ω resistor, a 220 µH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
Options- A. 138 MHz
- B. 10,866 Hz
- C. 1,907 Hz
- D. 138 kHz Discuss
Correct Answer: 10,866 Hz
- 10. In a series RLC circuit that is operating above the resonant frequency, the current
Options- A. lags the applied voltage
- B. leads the applied voltage
- C. is in phase with the applied voltage
- D. is zero Discuss
Correct Answer: lags the applied voltage
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