Circuit Theorems in AC Analysis Objective Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. Determine VTH for the circuit external to RL in the given figure.

(A) 135 ∠63.4° V
(B) 13.5 ∠63.4° V
(C) 13.5 ∠0° V
(D) 135 ∠0° V

2. A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
(A) True
(B) False

3. Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS?

(A) 226 mW
(B) 2.26 mW
(C) 4.24 mW
(D) 424 mW

4. Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
(A) True
(B) False

5. 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
(A) Is zero
(B) Is the sum of the two currents
(C) Is the difference between the two currents
(D) Cannot be determined

6. Referring to the given circuit, what is ZTH if R1 is changed to 220 Î©?

7. Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.
(A) True
(B) False

8. Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.
(A) True
(B) False

9. Norton's theorem gives
(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

10. One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.
(A) True
(B) False

11. Referring to the given circuit, determine ZTH as seen by RL.

12. Referring to the given circuit, what is VTH if VS = 12 ∠0° V?

(A) 4.69 ∠38.7° V
(B) 9.38 38.7° V
(C) 12 ∠0° V
(D) 6 ∠0° V

13. Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure.

(A) 1,027 Hz
(B) 10,270 Hz
(C) 6,330 Hz
(D) 63,330 Hz

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