MCQOPTIONS
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MCQOPTIONS
This section includes 63 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Miller's theorem is used in the high-frequency analysis of BJTs and FETs. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
One characteristic of amplifiers is that the sum of the voltage gain and the bandwidth is always constant when the roll-off is –20 dB/decade. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Bandwidth is the difference between fcl and fcu. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The lower and upper critical frequencies of an amplifier can be determined using the step-response method. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
The term "dBm" means decibels referenced to 1 mW of power. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The basis for the decibel unit stems from the logarithmic response of the human ear to the intensity of sound. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
A decade of frequency change is a change by a factor of 10. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
At the cutoff frequency the output is down 20 dB. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Internal transistor capacitances affect the high-frequency response of amplifiers. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Coupling and bypass capacitors affect the high-frequency response of an amplifier. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
What is the method that can be used to determine the values of fcl and fcu of an amplifier? |
| A. | five time constants |
| B. | step-response |
| C. | sinusoidal |
| Answer» C. sinusoidal | |
| 12. |
Refer to this figure. The output voltage at fcl = 12 mV. What is the output voltage at the midpoint frequency? |
| A. | 12 mV |
| B. | 12 mV p-p |
| C. | 16.97 mV |
| D. | 8.48 mV |
| Answer» D. 8.48 mV | |
| 13. |
An RC network has a roll-off of 20 dB per decade. What is the total attenuation between the output voltage in the midrange of the passband as compared to the output voltage at a frequency of 10 times fc? |
| A. | –3 dB |
| B. | –20 dB |
| C. | –23 dB |
| D. | –43 dB |
| Answer» C. –23 dB | |
| 14. |
Refer to this figure. If RL decreases in value, the output voltage will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| Answer» C. remain the same. | |
| 15. |
Refer to this figure. The capacitor Cbe affects |
| A. | high-frequency response. |
| B. | low-frequency response. |
| C. | midrange response. |
| D. | nothing. |
| Answer» B. low-frequency response. | |
| 16. |
Refer to this figure. The capacitor C1 affects |
| A. | high-frequency response. |
| B. | low-frequency response. |
| C. | midrange response. |
| D. | nothing. |
| Answer» C. midrange response. | |
| 17. |
Refer to this figure. The capacitor C3 affects |
| A. | high-frequency response. |
| B. | low-frequency response. |
| C. | midrange response. |
| D. | nothing. |
| Answer» C. midrange response. | |
| 18. |
An RC network has values of R = 1.2 k and C = 0.22 F. Find fc. |
| A. | 3.79 kHz |
| B. | 1.89 kHz |
| C. | 603 Hz |
| D. | 60 Hz |
| Answer» D. 60 Hz | |
| 19. |
A certain amplifier has a bandwidth of 22.5 kHz with a lower cutoff frequency of 600 Hz. What is the value of fcu? |
| A. | 600 Hz |
| B. | 22.5 kHz |
| C. | 23.1 kHz |
| D. | 21.9 kHz |
| Answer» D. 21.9 kHz | |
| 20. |
An amplifier has an Rin = 1.2 k. The coupling capacitor is 1 F. Determine the approximate lower cutoff frequency. |
| A. | 133 Hz |
| B. | 1.33 kHz |
| C. | 13.3 kHz |
| D. | 133 kHz |
| Answer» B. 1.33 kHz | |
| 21. |
An amplifier has an output voltage of 7.6 V p-p at the midpoint of the frequency range. What is the output at fc? |
| A. | 3.8 V p-p |
| B. | 3.8 Vrms |
| C. | 5.4 Vrms |
| D. | 5.4 V p-p |
| Answer» E. | |
| 22. |
If the power gain doubles, the decibel power gain increases by |
| A. | 3 dB |
| B. | A factor of 2 |
| C. | 10 dB |
| D. | 6 dB |
| Answer» B. A factor of 2 | |
| 23. |
At the lower or upper cutoff frequency, the voltage gain is |
| A. | 0.5Amid |
| B. | 0.35Amid |
| C. | 0.995Amid |
| D. | 0.707Amid |
| Answer» E. | |
| 24. |
Two stages have voltage gains of 100 and 200. The total decibel voltage gain is |
| A. | 66 dB |
| B. | 46 dB |
| C. | 106 dB |
| D. | 86 dB |
| Answer» E. | |
| 25. |
If the voltage gain doubles, the decibel voltage gain increases by |
| A. | 3 dB |
| B. | A factor of 2 |
| C. | 10 dB |
| D. | 6 dB |
| Answer» E. | |
| 26. |
At low frequencies, the coupling capacitors produce a decrease in |
| A. | Voltage gain |
| B. | Input resistance |
| C. | Generator voltage |
| D. | Generator resistance |
| Answer» B. Input resistance | |
| 27. |
If you want to improve the high-frequency response of an amplifier, which of these would you try? |
| A. | Increase the emitter bypass capacitance. |
| B. | Decrease the coupling capacitances. |
| C. | Increase the generator resistance |
| D. | Shorten leads as much as possible. |
| Answer» E. | |
| 28. |
Frequency response is a graph of voltage gain versus |
| A. | Power gain |
| B. | Frequency |
| C. | Output voltage |
| D. | Input voltage |
| Answer» C. Output voltage | |
| 29. |
Two stages have decibel voltage gains of 20 and 40 dB. The total ordinary voltage gain is |
| A. | 10 |
| B. | 1 |
| C. | 1000 |
| D. | 100 |
| Answer» D. 100 | |
| 30. |
If the voltage gain is 2000, the decibel voltage gain is |
| A. | 46 dB |
| B. | 40 dB |
| C. | 86 dB |
| D. | 66 dB |
| Answer» E. | |
| 31. |
If f = 1 MHz, and f2 = 10 Hz, the ratio f/f2 represents how many decades? |
| A. | 3 |
| B. | 2 |
| C. | 5 |
| D. | 4 |
| Answer» D. 4 | |
| 32. |
If the voltage gain is 100, the decibel voltage gain is |
| A. | 20 dB |
| B. | 6 dB |
| C. | 60 dB |
| D. | 40 dB |
| Answer» E. | |
| 33. |
Semilogarithmic paper means |
| A. | One axis is linear, and the other is semilogarithmic |
| B. | One axis is linear, and the other is logarithmic |
| C. | Neither axis is linear |
| D. | Both axes are semilogarithmic |
| Answer» C. Neither axis is linear | |
| 34. |
Refer to this figure. You are attempting to determine the lower cutoff frequency of this amplifier in the lab. As you change the input frequency and measure the output signal, you must remember to |
| A. | set the oscilloscope to DC. |
| B. | maintain the input voltage constant. |
| C. | keep a constant temperature. |
| D. | watch for a change of . |
| Answer» C. keep a constant temperature. | |
| 35. |
A two-times change in frequency is called a(n) |
| A. | binave. |
| B. | octave. |
| C. | decade. |
| D. | none of the above |
| Answer» C. decade. | |
| 36. |
Refer to this figure. If R L decreases in value, the output voltage will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | - |
| Answer» C. remain the same. | |
| 37. |
Halving the power corresponds to a ________ dB ________. |
| A. | 3, decrease |
| B. | 10, decrease |
| C. | 3, increase |
| D. | 10, increase |
| Answer» B. 10, decrease | |
| 38. |
An RC network has values of R = 1.2 k and C = 0.22 F. Find f c . |
| A. | 3.79 kHz |
| B. | 1.89 kHz |
| C. | 603 Hz |
| D. | 60 Hz |
| Answer» D. 60 Hz | |
| 39. |
What term means that the midrange voltage gain is assigned a value of 1 (or 0 dB)? |
| A. | critical |
| B. | Miller |
| C. | normalized |
| D. | corner |
| Answer» D. corner | |
| 40. |
In a multistage amplifier, the overall frequency response is determined by the |
| A. | frequency response of each stage depending on the relationships of the critical frequencies. |
| B. | frequency response of the first amplifier. |
| C. | frequency response of the last amplifier. |
| D. | lower critical frequency of the first amplifier and the upper critical frequency of the final amplifier. |
| Answer» B. frequency response of the first amplifier. | |
| 41. |
Refer to this figure. The upper cutoff frequency of this amplifier is 22 kHz. The output at that frequency is 6.71 V p-p. What is the output voltage at 220 kHz? |
| A. | 9.49 V p-p |
| B. | 6.71 V p-p |
| C. | 0.671 V p-p |
| D. | 0.0671 V p-p |
| Answer» D. 0.0671 V p-p | |
| 42. |
Refer to this figure. The capacitor C 1 affects |
| A. | high-frequency response. |
| B. | low-frequency response. |
| C. | midrange response. |
| D. | nothing. |
| Answer» C. midrange response. | |
| 43. |
Refer to this figure. You measure an output voltage at the lower cutoff frequency of 3.42 V p-p. The output voltage at the upper cutoff frequency will be |
| A. | 2.42 V p-p. |
| B. | 3.42 V p-p. |
| C. | 6.84 V p-p. |
| D. | 6.84 V rms . |
| Answer» C. 6.84 V p-p. | |
| 44. |
Refer to this figure. The capacitor C be affects |
| A. | high-frequency response. |
| B. | low-frequency response. |
| C. | midrange response. |
| D. | nothing. |
| Answer» B. low-frequency response. | |
| 45. |
The frequency response of an amplifier can be determined using the step response method, and measuring the output rise/fall times between |
| A. | 0% and 100% response. |
| B. | 10% and 90% response. |
| C. | 25% and 75% response. |
| D. | five time constant responses. |
| Answer» C. 25% and 75% response. | |
| 46. |
An amplifier has an output voltage of 7.6 V p-p at the midpoint of the frequency range. What is the output at f c ? |
| A. | 3.8 V p-p |
| B. | 3.8 V rms |
| C. | 5.4 V rms |
| D. | 5.4 V p-p |
| Answer» E. | |
| 47. |
A ten-times change in frequency is called a(n) |
| A. | octave. |
| B. | decade. |
| C. | decimal. |
| D. | none of the above |
| Answer» C. decimal. | |
| 48. |
For low-frequency response, all RC circuits in an amplifier may not have the same critical frequency. Which RC response will determine the critical frequency of the amplifier? |
| A. | the lowest frequency |
| B. | the center frequency |
| C. | the highest frequency |
| D. | the bypass frequency |
| Answer» D. the bypass frequency | |
| 49. |
It is often convenient in amplifiers to assign a certain value of gain as the ________ dB reference. |
| A. | 0 |
| B. | 1 |
| C. | 6 |
| D. | 10 |
| Answer» B. 1 | |
| 50. |
An RC network has a roll-off of 20 dB per decade. What is the total attenuation between the output voltage in the midrange of the passband as compared to the output voltage at a frequency of 10 times f c ? |
| A. | –3 dB |
| B. | –20 dB |
| C. | –23 dB |
| D. | –43 dB |
| Answer» C. –23 dB | |