MCQOPTIONS
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MCQOPTIONS
This section includes 24 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. |
What is the band pass (F 1 – F 2 ) of an RLC filter that resonates at 150 kHz and has a coil Q of 30? |
| A. | 100.0 kHz to 155.0 kHz |
| B. | 147.5 kHz to 152.5 kHz |
| C. | 295.5 kHz to 4500 kHz |
| D. | 149,970 Hz to 150,030 Hz |
| Answer» C. 295.5 kHz to 4500 kHz | |
| 2. |
What is the approximate phase angle in a series RLC circuit when V C = 117 V, V R = 14.5 V, and V L = 3.3 V? |
| A. | –45.0 degrees |
| B. | –82.7 degrees |
| C. | –90.0 degrees |
| D. | –172.7 degrees |
| Answer» C. –90.0 degrees | |
| 3. |
What is the total impedance of a 60 Hz series RLC circuit when X L = 7.5 ohms, X C = 265.3 ohms, and R = 33 ohms? |
| A. | 257.8 ohms |
| B. | 259.9 ohms |
| C. | 290.8 ohms |
| D. | 1989.75 ohms |
| Answer» C. 290.8 ohms | |
| 4. |
What is the current phase angle for a parallel RLC circuit when I L = 15.3 A, I C = 0.43 A, and I R = 3.5 A? |
| A. | 76.7 degrees |
| B. | –4.25 degrees |
| C. | 88.8 degrees |
| D. | –76.7 degrees |
| Answer» E. | |
| 5. |
How much current will flow in a series RLC circuit when V T = 100 V, X L = 160 , X C = 80 , and R = 60 ? |
| A. | 1 A |
| B. | 1 mA |
| C. | 6.28 A |
| D. | 10 A |
| Answer» B. 1 mA | |
| 6. |
When X C = X L the circuit: |
| A. | draws maximum current |
| B. | applied voltage is zero |
| C. | is at resonance |
| D. | draws minimum current |
| Answer» D. draws minimum current | |
| 7. |
What is the range between f 1 and f 2 of an RLC circuit that resonates at 150 kHz and has a Q of 30? |
| A. | 100.0 kHz to 155.0 kHz |
| B. | 147.5 kHz to 152.5 kHz |
| C. | 4500 kHz to 295.5 kHz |
| D. | 149,970 Hz to 150,030 Hz |
| Answer» C. 4500 kHz to 295.5 kHz | |
| 8. |
How much current will flow in a 100 Hz series RLC circuit if V S = 20 V, R T = 66 ohms, and X T = 47 ohms? |
| A. | 1.05 A |
| B. | 303 mA |
| C. | 247 mA |
| D. | 107 mA |
| Answer» D. 107 mA | |
| 9. |
What is the applied voltage for a series RLC circuit when I T = 3 mA, V L = 30 V, V C = 18 V, and R = 1000 ohms? |
| A. | 3.00 V |
| B. | 12.37 V |
| C. | 34.98 V |
| D. | 48.00 V |
| Answer» C. 34.98 V | |
| 10. |
A 15 resistor, an inductor with 8 inductive reactance, and a capacitor with 12 capacitive reactance are in parallel across an ac voltage source. The circuit impedance is |
| A. | 12.7 |
| B. | 127 |
| C. | 4,436 |
| D. | 6,174 |
| Answer» B. 127 | |
| 11. |
A 9 mH coil is in parallel with a 0.015 F capacitor across an 18 kHz ac source. The coil's internal resistance, R W , is 60 . The circuit impedance is |
| A. | 17,340 |
| B. | 1,734 |
| C. | 290 |
| D. | 1,018 |
| Answer» B. 1,734 | |
| 12. |
A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q , the bandwidth will |
| A. | increase |
| B. | remain the same |
| C. | decrease |
| D. | be less selective |
| Answer» D. be less selective | |
| 13. |
In a certain series resonant circuit, V C = 125 V, V L = 125 V, and V R = 40 V. The value of the source voltage is |
| A. | 125 V |
| B. | 250 V |
| C. | 290 V |
| D. | 40 V |
| Answer» E. | |
| 14. |
A 24 resistor, an inductor with a reactance of 120 , and a capacitor with a reactance of 120 are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is |
| A. | 60 V |
| B. | 660 V |
| C. | 30 V |
| D. | 300 V |
| Answer» E. | |
| 15. |
If the value of C in a series RLC circuit is decreased, the resonant frequency |
| A. | is not affected |
| B. | increases |
| C. | is reduced to zero |
| D. | decreases |
| Answer» C. is reduced to zero | |
| 16. |
A 90 resistor, a coil with 30 of reactance, and a capacitor with 50 of reactance are in series across a 12 V ac source. The current through the resistor is |
| A. | 9 mA |
| B. | 90 mA |
| C. | 13 mA |
| D. | 130 mA |
| Answer» E. | |
| 17. |
A 200 resistor, a coil with 30 of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance |
| A. | is 230 |
| B. | is 170 |
| C. | is 200 |
| D. | cannot be determined |
| Answer» D. cannot be determined | |
| 18. |
Referring to Problem 20, what is the total parallel resistance ( R p(tot) )? |
| A. | 4.99 |
| B. | 499 |
| C. | 4,992 |
| D. | 6,800 |
| Answer» D. 6,800 | |
| 19. |
A 6.8 k resistor, a 7 mH coil, and a 0.02 F capacitor are in parallel across a 17 kHz ac source. The coil's internal resistance, R W , is 30 . The equivalent parallel resistance, R p (eq), is |
| A. | 1,878 |
| B. | 18,780 |
| C. | 18,750 |
| D. | 626 |
| Answer» C. 18,750 | |
| 20. |
The impedance at the resonant frequency of a series RLC circuit with L = 20 mH, C = 0.02 F, and R W = 90 is |
| A. | 0 |
| B. | 90 |
| C. | 20 k |
| D. | 40 k |
| Answer» C. 20 k | |
| 21. |
A 12 resistor, a 40 F capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is |
| A. | 28.1 Hz |
| B. | 281 Hz |
| C. | 2,810 Hz |
| D. | 10 kHz |
| Answer» C. 2,810 Hz | |
| 22. |
A resistor of 3 k , a 0.05 F capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form? |
| A. | 636 |
| B. | 3,769 |
| C. | 433 |
| D. | 4,337 |
| Answer» E. | |
| 23. |
A 15 resistor, a 220 H coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit? |
| A. | 138 MHz |
| B. | 10,866 Hz |
| C. | 1,907 Hz |
| D. | 138 kHz |
| Answer» C. 1,907 Hz | |
| 24. |
A 10 resistor, a 90 mH coil, and a 0.015 F capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below f r is |
| A. | 1,616 |
| B. | 161 |
| C. | 3,387 |
| D. | 1,771 |
| Answer» B. 161 | |