MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Alternating Current and Voltage knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 |
| Answer» B. 10,270 Hz | |
| 2. |
For the circuit given, determine the Thevenin voltage as seen by R L . |
| A. | 0.574 16.7° V |
| B. | 5.74 16.7° V |
| C. | 0.574 –16.7° V |
| D. | 5.74 –16.7° V |
| Answer» E. | |
| 3. |
Referring to the given circuit, what is V TH if V S = 12 0° V? |
| A. | 4.69 38.7° V |
| B. | 9.38 38.7° V |
| C. | 12 0° V |
| D. | 6 0° V |
| Answer» C. 12 0° V | |
| 4. |
Determine V TH if R 1 is changed to 3.3 k . |
| A. | 0.574 16.7° V |
| B. | 4.63 16.7° V |
| C. | 4.63 39.5° V |
| D. | 0.463 39.5° V |
| Answer» D. 0.463 39.5° V | |
| 5. |
The Norton equivalent current is |
| A. | the current through the load |
| B. | the open-current from the source |
| C. | the short circuit current |
| D. | none of the above |
| Answer» D. none of the above | |
| 6. |
Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if V S = 4.5 V RMS ? |
| A. | 226 mW |
| B. | 2.26 mW |
| C. | 4.24 mW |
| D. | 424 mW |
| Answer» E. | |
| 7. |
Referring to the given circuit, determine Z TH as seen by R L . |
| A. | 1444 –48.5° |
| B. | 4176 –73.3° |
| C. | 956 –48.5° |
| D. | 1444 –73.3° |
| Answer» B. 4176 –73.3° | |
| 8. |
In order to get maximum power transfer from a capacitive source, the load must |
| 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 |
| Answer» C. be as capacitive as it is inductive | |
| 9. |
Referring to the given circuit, find Z TH for the part of the circuit that is external to R L . |
| A. | 129 21.4° |
| B. | 43.7 68.6° |
| C. | 43.7 21.4° |
| D. | 12.9 68.6° |
| Answer» C. 43.7 21.4° | |
| 10. |
Referring to the given circuit, L |
| A. | must be in parallel with R L |
| B. | must be placed in parallel with V S |
| C. | must have a reactance equal to X C |
| D. | has no effect on the result |
| Answer» E. | |
| 11. |
Referring to the given circuit, find Z TH if V S is 18 0° V. |
| A. | 9.82 –51.3° k |
| B. | 9.38 –51.3° k |
| C. | 180 –38.3° k |
| D. | 19.2 –38.3° k |
| Answer» C. 180 –38.3° k | |
| 12. |
Referring to the given figure, determine Z TH as seen by R L if R 1 is changed to 3.3 k . |
| A. | 1488 –70.7° |
| B. | 3859 –31.2° |
| C. | 5180 –50.5° |
| D. | 1828 –50.2° |
| Answer» E. | |
| 13. |
Determine V TH for the circuit external to R L in the given figure. |
| A. | 135 63.4° V |
| B. | 13.5 63.4° V |
| C. | 13.5 0° V |
| D. | 135 0° V |
| Answer» C. 13.5 0° V | |
| 14. |
Referring to the given circuit, what is Z TH if R 1 is changed to 220 ? |
| A. | 225 12.1° |
| B. | 225 77.9° |
| C. | 46 77.9° |
| D. | 46 12.1° |
| Answer» D. 46 12.1° | |
| 15. |
For the circuit shown, determine Z TH for the portion of the circuit external to R L . |
| A. | 66.7 –33.7° k |
| B. | 6.67 –333.7° k |
| C. | 14.4 –56.3° k |
| D. | 1.44 –33.7° k |
| Answer» C. 14.4 –56.3° k | |
| 16. |
Referring to the given circuit, find Z TH if R is 15 k and R L is 38 k . |
| A. | 89.82 –51.3° k |
| B. | 19.2 –38.3° k |
| C. | 9.38 –51.3° k |
| D. | 180 –38.3° k |
| Answer» D. 180 –38.3° k | |
| 17. |
For the given circuit, find V TH for the circuit external to R L . |
| A. | 4.69 51.3° V |
| B. | 4.69 38.7° V |
| C. | 469 38.7° mV |
| D. | 6 0° V |
| Answer» C. 469 38.7° mV | |
| 18. |
Determine V TH when R 1 is 180 and X L is 90 . |
| A. | 135 63.4° V |
| B. | 13.5 63.4° V |
| C. | 12.2 0° V |
| D. | 122 0° V |
| Answer» C. 12.2 0° V | |