Circuit Theorems In Ac Analysis MCQs

Question 1

Determine VTH if R1 is changed to 3.3 kΩ.

Accepted Answer

4.63 ∠39.5° V

Answer

0.574 ∠16.7° V

Answer

4.63 ∠16.7° V

Answer

0.463 ∠39.5° V

Question 2

Referring to the given figure, determine ZTH as seen by RL if R1 is changed to 3.3 kΩ.

Accepted Answer

1828 ∠-50.2° Ω

Answer

1488 ∠-70.7° Ω

Answer

3859 ∠-31.2° Ω

Answer

5180 ∠-50.5° Ω

Question 3

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

Accepted Answer

1444 ∠-48.5° Ω

Answer

4176 ∠-73.3° Ω

Answer

956 ∠-48.5° Ω

Answer

1444 ∠-73.3° Ω

Question 4

Referring to the given circuit, find ZTH for the part of the circuit that is external to RL.

Accepted Answer

43.7 ∠68.6° Ω

Answer

129 ∠21.4° Ω

Answer

43.7 ∠21.4° Ω

Answer

12.9 ∠68.6° Ω

Question 5

For the circuit shown, determine ZTH for the portion of the circuit external to RL.

Accepted Answer

6.67 ∠-333.7° kΩ

Answer

66.7 ∠-33.7° kΩ

Answer

14.4 ∠-56.3° kΩ

Answer

1.44 ∠-33.7° kΩ

Question 6

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

Accepted Answer

424 mW

Answer

226 mW

Answer

2.26 mW

Answer

4.24 mW