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Home Electrical Engineering RLC Circuits and Resonance Comments

  • Question
  • 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

  • Correct Answer
  • 12.7 Ω 


  • RLC Circuits and Resonance problems


    Search Results


    • 1. 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
    • 2. 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
    • 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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


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