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Home ‣ Electrical Engineering ‣ RLC Circuits and Resonance Comments
- Question
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
- Correct Answer
- 17,340 Ω
- 1. 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
- 2. 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
- 3. 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
- 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
- 5. 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
- 6. 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
- 7. 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
- 8. In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is
Options- A. 125 V
- B. 250 V
- C. 290 V
- D. 40 V Discuss
- 9. A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is
Options- A. 1,616 Ω
- B. 161 Ω
- C. 3,387 Ω
- D. 1,771 Ω Discuss
- 10. If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
Options- A. disappears
- B. becomes sharper
- C. increases
- D. decreases Discuss
RLC Circuits and Resonance problems
Search Results
Correct Answer: 130 mA
Correct Answer: 12.7 Ω
Correct Answer: 4,337 Ω
Correct Answer: 6 kHz
Correct Answer: 4,992 Ω
Correct Answer: 10,866 Hz
Correct Answer: lags the applied voltage
Correct Answer: 40 V
Correct Answer: 1,616 Ω
Correct Answer: decreases
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