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MCQOPTIONS
This section includes 66 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
An low-pass filter consists of a 5.6 mH coil and a 3.3 k resistor. The output voltage is taken across the resistor. The circuit's critical frequency is |
| A. | 93.8 kHz |
| B. | 93.8 Hz |
| C. | 861 Hz |
| D. | 86.12 kHz |
| Answer» B. 93.8 Hz | |
| 3. |
In a series resonant band-pass filter, a lower value of results in |
| A. | a higher resonant frequency |
| B. | a smaller bandwidth |
| C. | a higher impedance |
| D. | a larger bandwidth |
| Answer» E. | |
| 4. |
A parallel resonant band-pass filter consists of a 90 resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 . What is the center frequency of the filter? |
| A. | 459 Hz |
| B. | 4,591 Hz |
| C. | 999 Hz |
| D. | 2,176 Hz |
| Answer» C. 999 Hz | |
| 5. |
A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
The output voltage is 63.3% of its maximum at the critical frequencies. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
In an high-pass filter, the output is taken across the inductor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
In an high-pass filter, the output is taken across the resistor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
The bandwidth of a resonant filter is determined by the quality factor () of the circuit and the resonant frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
An high-pass filter consists of a 470 resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is |
| A. | 125 Hz |
| B. | 1,250 Hz |
| C. | 564 Hz |
| D. | 5,644 Hz |
| Answer» B. 1,250 Hz | |
| 12. |
A parallel resonant band-pass filter consists of a 6.8 resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume = 0 . What is the center frequency of the filter? |
| A. | 5.14 MHz |
| B. | 514 kHz |
| C. | 5.03 MHz |
| D. | 503 kHz |
| Answer» B. 514 kHz | |
| 13. |
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 resistor. The winding resistance of the coil is 12 . The output voltage is taken off the resistor. Input voltage is 12 V. What is the output voltage magnitude at the center frequency ()? |
| A. | 10.9 V |
| B. | 1.09 V |
| C. | 1.1 V |
| D. | 12 V |
| Answer» B. 1.09 V | |
| 14. |
An low-pass filter consists of a 120 resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuit's critical frequency is |
| A. | 333 kHz |
| B. | 633 kHz |
| C. | 331 kHz |
| D. | 60 kHz |
| Answer» C. 331 kHz | |
| 15. |
A series resonant band-stop filter consists of a 68 resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, , of the coil is 4 . Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at ? |
| A. | 1.1 mV |
| B. | 11.1 mV |
| C. | 111 mV |
| D. | 200 mV |
| Answer» C. 111 mV | |
| 16. |
A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an low-pass filter. If the reactance at the input frequency is zero, the output voltage is |
| A. | 18 V peak-to-peak |
| B. | zero |
| C. | 9 V peak-to-peak |
| D. | 12.74 V peak-to-peak |
| Answer» C. 9 V peak-to-peak | |
| 17. |
= 500 mV, and = 1.3 V. The ratio / expressed in dB is |
| A. | 0 dB |
| B. | 8.30 dB |
| C. | –8.30 dB |
| D. | 0.8 dB |
| Answer» D. 0.8 dB | |
| 18. |
In a certain low-pass filter, = 3.5 kHz. Its passband is |
| A. | 0 Hz to 3.5 kHz |
| B. | 0 Hz |
| C. | 3.5 kHz |
| D. | 7 kHz |
| Answer» B. 0 Hz | |
| 19. |
An high-pass filter consists of a 0.2 F capacitor and a 220 resistor. The output is taken across the resistor. The circuit's critical frequency is |
| A. | 723 Hz |
| B. | 7,234 Hz |
| C. | 362 Hz |
| D. | 3,617 Hz |
| Answer» E. | |
| 20. |
In an low-pass filter, the output voltage is taken across the inductor and the output lags the input. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
The roll-off rate of a basic or filter is 20 dB per decade. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
Critical frequencies are also called –3 dB frequencies. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 23. |
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 resistor. The winding resistance of the coil is 12 . The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)? |
| A. | 10.9 V |
| B. | 1.09 V |
| C. | 1.1 V |
| D. | 12 V |
| Answer» B. 1.09 V | |
| 24. |
An RL low-pass filter consists of a 5.6 mH coil and a 3.3 kΩ resistor. The output voltage is taken across the resistor. The circuit's critical frequency is |
| A. | 3.8 kHz |
| B. | 3.8 Hz |
| C. | 61 Hz |
| D. | 6.12 kHz |
| Answer» B. 3.8 Hz | |
| 25. |
A parallel resonant band-pass filter consists of a 6.8 Ω resistor in series with a parallel network made up of an 8 µH coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 Ω. What is the center frequency of the filter? |
| A. | 5.14 MHz |
| B. | 514 kHz |
| C. | 5.03 MHz |
| D. | 503 kHz |
| Answer» B. 514 kHz | |
| 26. |
A parallel resonant band-pass filter consists of a 90 Ω resistor in series with a parallel network made up of a 60 mH coil and a 0.02 µF capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 Ω. What is the center frequency of the filter? |
| A. | 459 Hz |
| B. | 4,591 Hz |
| C. | 999 Hz |
| D. | 2,176 Hz |
| Answer» C. 999 Hz | |
| 27. |
In an RL low-pass filter, the output voltage is taken across the inductor and the output lags the input. |
| A. | True |
| B. | False |
| Answer» C. | |
| 28. |
In a certain low-pass filter, fc = 3.5 kHz. If the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude? |
| A. | 0 V |
| B. | 5.97 V |
| C. | 6 V |
| D. | 597 mV |
| Answer» C. 6 V | |
| 29. |
In an RC low-pass filter, the output voltage is taken across the resistor and the output lags the input voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 30. |
An RL high-pass filter consists of a 470 Ω resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is |
| A. | 125 Hz |
| B. | 1,250 Hz |
| C. | 564 Hz |
| D. | 5,644 Hz |
| Answer» B. 1,250 Hz | |
| 31. |
An RC high-pass filter consists of a 0.2 µF capacitor and a 220 Ω resistor. The output is taken across the resistor. The circuit's critical frequency is |
| A. | 723 Hz |
| B. | 7,234 Hz |
| C. | 362 Hz |
| D. | 3,617 Hz |
| Answer» E. | |
| 32. |
An RC low-pass filter consists of a 120 Ω resistor and a 0.002 µF capacitor. The output is taken across the capacitor. The circuit's critical frequency is |
| A. | 333 kHz |
| B. | 633 kHz |
| C. | 331 kHz |
| D. | 60 kHz |
| Answer» C. 331 kHz | |
| 33. |
The output voltage is 63.3% of its maximum at the critical frequencies. |
| A. | True |
| B. | False |
| Answer» C. | |
| 34. |
In an RL high-pass filter, the output is taken across the inductor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 35. |
In an RC high-pass filter, the output is taken across the resistor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 36. |
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 µF capacitor, and a 120 Ω resistor. The winding resistance of the coil is 12 Ω. The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)? |
| A. | 10.9 V |
| B. | 1.09 V |
| C. | 1.1 V |
| D. | 12 V |
| Answer» B. 1.09 V | |
| 37. |
In a certain low-pass filter, fc = 3.5 kHz. Its pass-band is |
| A. | 0 Hz to 3.5 kHz |
| B. | 0 Hz |
| C. | 3.5 kHz |
| D. | 7 kHz |
| Answer» B. 0 Hz | |
| 38. |
An RC high-pass filter consists of an 820 Ω resistor. What is the value of C so that Xc is ten times less than Rat an input frequency of 12 kHz? |
| A. | 81 µF |
| B. | 161 µF |
| C. | 0.161 µF |
| D. | 220 µF |
| Answer» D. 220 µF | |
| 39. |
In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency is |
| A. | 7 kHz |
| B. | 10 kHz |
| C. | 12 kHz |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 40. |
A band-pass filter rejects all frequencies within a band between a lower and an upper critical frequency and passes all others. |
| A. | True |
| B. | False |
| Answer» C. | |
| 41. |
Critical frequencies are also called -3 dB frequencies. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 42. |
A series resonant band-stop filter consists of a 68 Ω resistor, a 110 mH coil, and a 0.02 µF capacitor. The internal resistance, RW, of the coil is 4 Ω. Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0? |
| A. | 1.1 mV |
| B. | 11.1 mV |
| C. | 111 mV |
| D. | 200 mV |
| Answer» C. 111 mV | |
| 43. |
Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is |
| A. | 0 dB |
| B. | 8.30 dB |
| C. | -8.30 dB |
| D. | 0.8 dB |
| Answer» D. 0.8 dB | |
| 44. |
The bandwidth of a resonant filter is determined by the quality factor (Q) of the circuit and the resonant frequency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 45. |
A band-stop filter passes frequencies between its lower and upper critical frequencies and rejects all others. |
| A. | True |
| B. | False |
| Answer» C. | |
| 46. |
An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k resistor. The output voltage is taken across the resistor. The circuit's critical frequency is |
| A. | 93.8 kHz |
| B. | 93.8 Hz |
| C. | 861 Hz |
| D. | 86.12 kHz |
| Answer» B. 93.8 Hz | |
| 47. |
At a certain frequency, the output voltage of a filter is 6 V and the input is 12 V. The voltage ratio in decibels is |
| A. | 6.02 dB |
| B. | –6.02 dB |
| C. | 12.04 dB |
| D. | –12.04 dB |
| Answer» C. 12.04 dB | |
| 48. |
Referring to Problem 8, assume the input voltage is 15 V dc. What is the output voltage? |
| A. | 0 V |
| B. | 15 V |
| C. | 7.07 V |
| D. | 10.6 V |
| Answer» C. 7.07 V | |
| 49. |
Referring to Problem 15, if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude? |
| A. | 6 V |
| B. | 597 mV |
| C. | 5.97 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 50. |
The same signal in Problem 2 is applied to an RC high-pass filter. If the reactance is zero at the input frequency, the output voltage is |
| A. | 18 V peak-to-peak |
| B. | zero |
| C. | 9 V peak-to-peak |
| D. | 12.73 V peak-to-peak |
| Answer» B. zero | |