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  • Question
  • Referring to the given circuit, find ZTH if R is 15 kΩ and RL is 38 kΩ.

    Referring to the given circuit, find ZTH if R is 15 k? and RL is 38 k?. 89.82 ??51.3° k? 19.2 ??38.3


  • Options
  • A. 89.82 ∠?51.3° kΩ
  • B. 19.2 ∠?38.3° kΩ
  • C. 9.38∠?51.3° kΩ
  • D. 180 ∠?38.3° kΩ

  • Correct Answer
  • 9.38∠?51.3° kΩ 


  • Circuit Theorems in AC Analysis problems


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    • 1. If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

    • Options
    • A. is zero
    • B. is the sum of the two currents
    • C. is the difference between the two currents
    • D. cannot be determined
    • Discuss
    • 2. Norton's theorem gives

    • Options
    • A. an equivalent current source in parallel with an equivalent impedance
    • B. an equivalent current source in series with an equivalent impedance
    • C. an equivalent voltage source in parallel with an equivalent impedance
    • D. an equivalent voltage source in series with an equivalent impedance
    • Discuss
    • 3. Determine VTH if R1 is changed to 3.3 kΩ.


    • Options
    • A. 0.574∠16.7° V
    • B. 4.63∠16.7° V
    • C. 4.63∠39.5° V
    • D. 0.463∠39.5° V
    • Discuss
    • 4. Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.


    • Options
    • A. 1,027 Hz
    • B. 10,270 Hz
    • C. 6,330 Hz
    • D. 63,330 Hz
    • Discuss
    • 5. Referring to the given figure, determine ZTH as seen by RL if R1 is changed to 3.3 kΩ.


    • Options
    • A. 1488∠?70.7° Ω
    • B. 3859 ∠?31.2° Ω
    • C. 5180 ∠?50.5° Ω
    • D. 1828∠?50.2° Ω
    • Discuss
    • 6. In order to get maximum power transfer from a capacitive source, the load must

    • Options
    • A. have a capacitive reactance equal to circuit resistance
    • B. have an impedance that is the complex conjugate of the source impedance
    • C. be as capacitive as it is inductive
    • D. none of the above
    • Discuss
    • 7. For the circuit shown, determine ZTH for the portion of the circuit external to RL.


    • Options
    • A. 66.7 ∠?33.7° kΩ
    • B. 6.67∠?333.7° kΩ
    • C. 14.4 ∠?56.3° kΩ
    • D. 1.44 ∠?33.7° kΩ
    • Discuss
    • 8. If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage?

    • Options
    • A. 0 V
    • B. 90 V
    • C. 156 V
    • D. 180 V
    • Discuss
    • 9. A three-phase △-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ?a = 12 ∠30° A, what are the polar expressions for the other phase currents?

    • Options
    • A. I ?b = 12 ∠150° A, I ?c = 12∠?90° A
    • B. I ?b = 12∠120° A, I ?c = 12∠30° A
    • C. I ?b = 12∠30° A, I ?c = 12∠120° A
    • D. I ?b = 12∠90° A, I ?c = 12∠90° A
    • Discuss
    • 10. In a △-connected generator, all of the phase voltages are

    • Options
    • A. zero
    • B. equal in magnitude
    • C. one-third of total
    • D. one-sixth of total
    • Discuss


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