MCQOPTIONS
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MCQOPTIONS
This section includes 136 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the range between and of an circuit that resonates at 150 kHz and has a 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 | |
| 2. |
What is the applied voltage for a series RLC circuit when I = 3 mA, V = 30 V, V = 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 | |
| 3. |
How much current will flow in a 100 Hz series RLC circuit if V = 20 V, R = 66 ohms, and X = 47 ohms? |
| A. | 1.05 A |
| B. | 303 mA |
| C. | 247 mA |
| D. | 107 mA |
| Answer» D. 107 mA | |
| 4. |
Resonance will occur when X = X in the circuit below. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
The resonant frequency f is 19 kHz. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
The impedance is 1177 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
When X = X the circuit: |
| A. | draws maximum current |
| B. | applied voltage is zero |
| C. | is at resonance |
| D. | draws minimum current |
| Answer» D. draws minimum current | |
| 8. |
How much current will flow in a series circuit when = 100 V, = 160 , = 80 , and = 60 ? |
| A. | 1 A |
| B. | 1 mA |
| C. | 6.28 A |
| D. | 10 A |
| Answer» B. 1 mA | |
| 9. |
What is the approximate phase angle in a series RLC circuit when V = 117 V, V = 14.5 V, and V = 3.3 V? |
| A. | –45.0 degrees |
| B. | –82.7 degrees |
| C. | –90.0 degrees |
| D. | –172.7 degrees |
| Answer» C. –90.0 degrees | |
| 10. |
Which statement best describes reactance in a series circuit? |
| A. | Capacitive reactance is always dominant. |
| B. | Inductive reactance is always dominant. |
| C. | Resistance is always dominant. |
| D. | The larger of the two reactances is dominant. |
| Answer» E. | |
| 11. |
What is the band pass (F – F) 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 | |
| 12. |
What is the total impedance of a 60 Hz series RLC circuit when X = 7.5 ohms, X = 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 | |
| 13. |
Series impedance or voltage totals must always be calculated by |
| A. | adding values vectorially |
| B. | graphing the angles |
| C. | multiplying the values |
| D. | subtracting the values |
| Answer» B. graphing the angles | |
| 14. |
What is the current phase angle for a parallel RLC circuit when I = 15.3 A, I = 0.43 A, and I = 3.5 A? |
| A. | 76.7 degrees |
| B. | –4.25 degrees |
| C. | 88.8 degrees |
| D. | –76.7 degrees |
| Answer» E. | |
| 15. |
What is the range between f and f 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 | |
| 16. |
The quality factor at resonance of a series circuit is V/V. |
| A. | True |
| B. | False |
| Answer» C. | |
| 17. |
The impedance is 160 . |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
The impedance is 9684 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
Series combinations are used more often in tuned amplifier circuits than are parallel combinations. |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
The quality factor of a parallel circuit at resonance is V/V or V/V. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
By increasing the resistance of a coil you can increase the of the coil at resonance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
What is the band pass (F1 – F2) 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 | |
| 23. |
In a series RLC circuit the current can be found using: |
| A. | [A]. |
| B. | [B]. |
| C. | both of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 24. |
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, RW, is 30 . The equivalent parallel resistance, Rp(eq), is |
| A. | 1,878 |
| B. | 18,780 |
| C. | 18,750 |
| D. | 626 |
| Answer» C. 18,750 | |
| 25. |
Referring to Problem 20, what is the total parallel resistance (Rp(tot))? |
| A. | 4.99 |
| B. | 499 |
| C. | 4,992 |
| D. | 6,800 |
| Answer» D. 6,800 | |
| 26. |
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 | |
| 27. |
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. | |
| 28. |
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 | |
| 29. |
A resonant circuit has a lower critical frequency of 7 kHz and an upper critical frequency of 13 kHz. The bandwidth of the circuit is |
| A. | 7 kHz |
| B. | 13 kHz |
| C. | 20 kHz |
| D. | 4 kHz |
| Answer» E. | |
| 30. |
XL and XC have opposing effects in an RLC circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 31. |
A 24 Ω resistor, an inductor with a reactance of 120 Ω, and a capacitor with a reactance of 120 Ω 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. | |
| 32. |
The quality factor (Q) is the ratio of true power to apparent power. |
| A. | True |
| B. | False |
| Answer» C. | |
| 33. |
A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω 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. | |
| 34. |
In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is |
| A. | 125 V |
| B. | 250 V |
| C. | 290 V |
| D. | 40 V |
| Answer» E. | |
| 35. |
A resistor of 3 kΩ, a 0.05 µF 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 Ω |
| B. | 3,769 Ω |
| C. | 433 Ω |
| D. | 4,337 Ω |
| Answer» E. | |
| 36. |
A 12 Ω resistor, a 40 µF 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 | |
| 37. |
In a series RLC circuit that is operating above the resonant frequency, the current |
| A. | Lags the applied voltage |
| B. | Leads the applied voltage |
| C. | Is in phase with the applied voltage |
| D. | Is zero |
| Answer» B. Leads the applied voltage | |
| 38. |
A certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 µF, and L = 10 mH. The total impedance, expressed in polar form, is |
| A. | 12.28 ∠12.34° Ω |
| B. | 12.57 ∠12.34° Ω |
| C. | 9.95 ∠12.34° Ω |
| D. | 12.62 ∠12.34° Ω |
| Answer» B. 12.57 ∠12.34° Ω | |
| 39. |
At series resonance, the inductive reactance and capacitive reactance are never equal. |
| A. | True |
| B. | False |
| Answer» C. | |
| 40. |
A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is |
| A. | 1,616 Ω |
| B. | 161 Ω |
| C. | 3,387 Ω |
| D. | 1,771 Ω |
| Answer» B. 161 Ω | |
| 41. |
A series resonant circuit is commonly called a tank circuit. |
| A. | True |
| B. | False |
| Answer» C. | |
| 42. |
In a series RLC circuit, the current is minimum at resonance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 43. |
A 15 Ω resistor, a 220 µH 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 | |
| 44. |
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 | |
| 45. |
If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth |
| A. | Disappears |
| B. | Becomes sharper |
| C. | Increases |
| D. | Decreases |
| Answer» E. | |
| 46. |
A 200 Ω resistor, a coil with 30 Ω of reactance, and a capacitor of unknown reactance are in series across an ac source. The circuit is at resonance. Circuit impedance is |
| A. | 230 Ω |
| B. | 170 Ω |
| C. | 200 Ω |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 47. |
A 9 mH coil is in parallel with a 0.015 µF capacitor across an 18 kHz ac source. The coil's internal resistance RW, is 60 Ω. The circuit impedance is |
| A. | 17,340 Ω |
| B. | 1,734 Ω |
| C. | 290 Ω |
| D. | 1,018 Ω |
| Answer» B. 1,734 Ω | |
| 48. |
A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is |
| A. | 12.7 Ω |
| B. | 127 Ω |
| C. | 4,436 Ω |
| D. | 6,174 Ω |
| Answer» B. 127 Ω | |
| 49. |
The reactive voltages, VL and VC, cancel at resonance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 50. |
To tune a parallel resonant circuit to a higher frequency, the capacitance should be |
| A. | Increased |
| B. | Decreased |
| C. | Left alone |
| D. | Replaced with inductance |
| Answer» C. Left alone | |