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Home ‣ Electrical Engineering ‣ RLC Circuits and Resonance Comments
  • Question

  • A 12 Ω resistor, a 40 µF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is


  • Options
  • A. 28.1 Hz
  • B. 281 Hz
  • C. 2,810 Hz
  • D. 10 kHz

  • Correct Answer
  • 281 Hz 

    • RLC Circuits and Resonance problems

    Search Results

    • 1. The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 µF, and RW = 90 Ω is

    • Options
    • A. 0 Ω
    • B. 90 Ω
    • C. 20 kΩ
    • D. 40 kΩ
      • Discuss
    • 2. To tune a parallel resonant circuit to a higher frequency, the capacitance should be

    • Options
    • A. increased
    • B. decreased
    • C. left alone
    • D. replaced with inductance
      • Discuss
    • 3. A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is

    • Options
    • A. 60 V
    • B. 660 V
    • C. 30 V
    • D. 300 V
      • Discuss
    • 4. A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 µF, and L = 10 mH. The total impedance, expressed in polar form, is

    • Options
    • A. 12.28∠12.34° Ω
    • B. 12.57∠12.34° Ω
    • C. 9.95∠12.34° Ω
    • D. 12.62∠12.34° Ω
      • Discuss
    • 5. A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 µF capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, RW, is 30 Ω. The equivalent parallel resistance, Rp(eq), is

    • Options
    • A. 1,878 Ω
    • B. 18,780 Ω
    • C. 18,750 Ω
    • D. 626 Ω
      • Discuss
    • 6. Referring to Problem 8, the total current is

    • Options
    • A. 1.5 A
    • B. 573 mA
    • C. 5.73 A
    • D. 1.19 A
      • Discuss
    • 7. If the value of C in a series RLC circuit is decreased, the resonant frequency

    • Options
    • A. is not affected
    • B. increases
    • C. is reduced to zero
    • D. decreases
      • Discuss
    • 8. Referring to the given circuit, find ZTH if VS is 18∠0° V.


    • Options
    • A. 9.82 ∠?51.3° kΩ
    • B. 9.38∠?51.3° kΩ
    • C. 180 ∠?38.3° kΩ
    • D. 19.2 ∠?38.3° kΩ
      • Discuss
    • 9. The Norton equivalent current is

    • Options
    • A. the current through the load
    • B. the open-current from the source
    • C. the short circuit current
    • D. none of the above
      • Discuss
    • 10. Determine VTH when R1 is 180 Ω and XL is 90 Ω.


    • Options
    • A. 135∠63.4° V
    • B. 13.5∠63.4° V
    • C. 12.2∠0° V
    • D. 122∠0° V
      • Discuss

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