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  • Question

  • Referring to the given circuit, find ZTH if VS is 18∠0° V.

    Referring to the given circuit, find ZTH if VS is 18?0° V. 9.82 ??51.3° k? 9.38??51.3° k? 180 ??38.3


  • Options
  • A. 9.82 ∠?51.3° kΩ
  • B. 9.38∠?51.3° kΩ
  • C. 180 ∠?38.3° kΩ
  • D. 19.2 ∠?38.3° kΩ

  • Correct Answer
  • 9.38∠?51.3° kΩ 

    • Circuit Theorems in AC Analysis problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
      • Discuss
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. Referring to the given circuit, determine ZTH as seen by RL.


    • Options
    • A. 1444∠?48.5° Ω
    • B. 4176 ∠?73.3° Ω
    • C. 956 ∠?48.5° Ω
    • D. 1444 ∠?73.3° Ω
      • Discuss
    • 9. The two basic components of a Thevenin equivalent ac circuit are

    • Options
    • A. the equivalent voltage source and the equivalent series impedance
    • B. the equivalent voltage source and the equivalent series resistance
    • C. the equivalent voltage source and the equivalent parallel impedance
    • D. the equivalent voltage source and the equivalent parallel resistance
      • Discuss
    • 10. Referring to the given circuit, L


    • Options
    • A. must be in parallel with RL
    • B. must be placed in parallel with VS
    • C. must have a reactance equal to XC
    • D. has no effect on the result
      • Discuss

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