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### EEE :: Circuit Theorems in AC Analysis

1. Determine VTH when R1 is 180 and XL is 90 .

2.  A. 13563.4° V B. 13.563.4° V C. 12.20° V D. 1220° V

3. For the given circuit, find VTH for the circuit external to RL.

4.  A. 4.6951.3° V B. 4.6938.7° V C. 46938.7° mV D. 60° V

5. Referring to the given circuit, find ZTH if R is 15 k and RL is 38 k.

6.  A. 89.82 –51.3° k B. 19.2 –38.3° k C. 9.38–51.3° k D. 180 –38.3° k

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

8.  A. 66.7 –33.7° k B. 6.67–333.7° k C. 14.4 –56.3° k D. 1.44 –33.7° k

9. Referring to the given circuit, what is ZTH if R1 is changed to 220 ?

10.  A. 22512.1° B. 22577.9° C. 4677.9° D. 4612.1°

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

12.  A. 13563.4° V B. 13.563.4° V C. 13.50° V D. 1350° V

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

14.  A. 1488–70.7° B. 3859 –31.2° C. 5180 –50.5° D. 1828–50.2°

15. The two basic components of a Thevenin equivalent ac circuit are

16.  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

17. Referring to the given circuit, find ZTH if VS is 180° V.

18.  A. 9.82 –51.3° k B. 9.38–51.3° k C. 180 –38.3° k D. 19.2 –38.3° k

19. In applying the superposition theorem,

20.  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