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  • Question

  • Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω?

    Referring to the given circuit, what is ZTH if R1 is changed to 220 ?? 225?12.1° ? 225?77.9° ? 46?77


  • Options
  • A. 225∠12.1° Ω
  • B. 225∠77.9° Ω
  • C. 46∠77.9° Ω
  • D. 46∠12.1° Ω

  • Correct Answer
  • 46∠77.9° Ω 

    • Circuit Theorems in AC Analysis problems

    Search Results

    • 1. For the circuit given, determine the Thevenin voltage as seen by RL.


    • Options
    • A. 0.574∠16.7° V
    • B. 5.74∠16.7° V
    • C. 0.574 ∠?16.7° V
    • D. 5.74∠?16.7° V
      • Discuss
    • 2. In applying the superposition theorem,

    • Options
    • A. the sources are considered one at a time with all others replaced by their internal impedance
    • B. all sources are considered independently
    • C. all sources are considered simultaneously
    • D. the sources are considered one at a time with all others replaced by their internal resistance
      • Discuss
    • 3. For the given circuit, find VTH for the circuit external to RL.


    • Options
    • A. 4.69∠51.3° V
    • B. 4.69∠38.7° V
    • C. 469∠38.7° mV
    • D. 6∠0° V
      • Discuss
    • 4. 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
    • 5. 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
    • 6. Referring to the given circuit, what is VTH if VS = 12∠0° V?


    • Options
    • A. 4.69∠38.7° V
    • B. 9.38∠38.7° V
    • C. 12∠0° V
    • D. 6∠0° V
      • Discuss
    • 7. Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?


    • Options
    • A. 226 mW
    • B. 2.26 mW
    • C. 4.24 mW
    • D. 424 mW
      • Discuss
    • 8. The Thevenin equivalent voltage is

    • Options
    • A. equal to the source voltage
    • B. the same as the load voltage
    • C. the open circuit voltage
    • D. none of the above
      • Discuss
    • 9. Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.


    • Options
    • A. 129∠21.4° Ω
    • B. 43.7∠68.6° Ω
    • C. 43.7∠21.4° Ω
    • D. 12.9∠68.6° Ω
      • Discuss
    • 10. Determine VTH for the circuit external to RL in the given figure.


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

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