MCQOPTIONS
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MCQOPTIONS
This section includes 66 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. |
The bandwidth ________ in a multistage amplifier compared to an identical single-stage amplifier. |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | None of the above |
| Answer» C. remains the same | |
| 2. |
The magnitude of the third harmonic is ________ of the magnitude of the fundamental. |
| A. | 1 |
| B. | 0.5 |
| C. | 0.33 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 3. |
The ________ in the Fourier series has the same frequency as the square wave itself. |
| A. | fundamental |
| B. | third harmonic |
| C. | fifth harmonic |
| D. | seventh harmonic |
| Answer» B. third harmonic | |
| 4. |
For two identical stages in cascade, the drop-off rate in the high- and low-frequency regions has increased to ________ per decade. |
| A. | –3 dB |
| B. | –6 dB |
| C. | –20 dB |
| D. | –40 dB |
| Answer» E. | |
| 5. |
is ________ than in a common-base configuration. |
| A. | significantly smaller |
| B. | smaller |
| C. | significantly greater |
| D. | None of the above |
| Answer» D. None of the above | |
| 6. |
The ________ of the upper cutoff frequencies defines a ________ possible bandwidth for a system. |
| A. | highest, maximum |
| B. | lowest, maximum |
| C. | lowest, minimum |
| D. | None of the above |
| Answer» C. lowest, minimum | |
| 7. |
If the parasitic capacitors were the only elements to determine the high cutoff frequency, the ________ frequency would be the determining factor. |
| A. | lowest |
| B. | highest |
| C. | lowest or highest |
| D. | None of the above |
| Answer» B. highest | |
| 8. |
The ________ configuration displays improved high-frequency characteristics over the ________ configuration. |
| A. | common-collector, common-emitter |
| B. | common-emitter, common-base |
| C. | common-emitter, common-collector |
| D. | common-base, common-emitter |
| Answer» E. | |
| 9. |
At very high frequencies, the effect of Ci is to ________ the total impedance of the parallel combination of R1, R2, R3, and Ci. |
| A. | increase |
| B. | maintain |
| C. | decrease |
| D. | None of the above |
| Answer» D. None of the above | |
| 10. |
With a BJT amplifier in the high-frequency region, the capacitance Cbe is the ________ of the parasitic capacitances while Cce is the ________. |
| A. | smallest, largest |
| B. | largest, smallest |
| C. | smallest, medium |
| D. | None of the above |
| Answer» C. smallest, medium | |
| 11. |
The ________ region produces the maximum voltage gain in a single-stage BJT or FET amplifier. |
| A. | low-frequency |
| B. | mid-frequency |
| C. | high-frequency |
| D. | None of the above |
| Answer» C. high-frequency | |
| 12. |
The Miller effect is meaningful in the ________ amplifier. |
| A. | inverting |
| B. | noninverting |
| C. | inverting/noninverting |
| D. | None of the above |
| Answer» B. noninverting | |
| 13. |
For any inverting amplifier, the impedance capacitance will be ________ by a Miller effect capacitance sensitive to the gain of the amplifier and the interelectrode capacitance. |
| A. | unaffected |
| B. | increased |
| C. | decreased |
| D. | None of the above |
| Answer» D. None of the above | |
| 14. |
In the low-frequency region, the ________ low-frequency cutoff determined by CS, CC, or CE will have the greatest impact on the network. |
| A. | highest |
| B. | average |
| C. | lowest |
| D. | None of the above |
| Answer» B. average | |
| 15. |
A change in frequency by a factor of 10 results in a ________ change in the ratio of the normalized gain. |
| A. | 3-dB |
| B. | 6-dB |
| C. | 10-dB |
| D. | 20-dB |
| Answer» E. | |
| 16. |
A change in frequency by a factor of 2 results in a ________ change in the ratio of the normalized gain. |
| A. | 3-dB |
| B. | 6-dB |
| C. | 10-dB |
| D. | 20-dB |
| Answer» C. 10-dB | |
| 17. |
In the input RC circuit of a single-stage BJT or FET amplifier, as the frequency ________, the capacitive reactance ________ and ________ of the input voltage appears across the output terminals. |
| A. | increases, decreases, more |
| B. | increases, decreases, less |
| C. | increases, increases, more |
| D. | decreases, decreases, less |
| Answer» B. increases, decreases, less | |
| 18. |
To fix the frequency boundaries of relatively high gain, ________ was chosen to be the gain at the cutoff levels. |
| A. | 0.5Av mid |
| B. | 0.707Av mid |
| C. | Av low |
| D. | 0.5Av high |
| Answer» C. Av low | |
| 19. |
For the RC-coupled amplifier, the drop in gain at low frequencies is due to the increasing reactance of ________. |
| A. | CC |
| B. | Cs |
| C. | CE |
| D. | All of the above |
| Answer» E. | |
| 20. |
Voltage gains of ________ dB or higher should immediately be recognized as being quite high. |
| A. | 3 |
| B. | 6 |
| C. | 20 |
| D. | 50 |
| Answer» E. | |
| 21. |
The decibel gain of a cascaded system is the ________ of the decibel gains of each stage. |
| A. | sum |
| B. | difference |
| C. | product |
| D. | quotient |
| Answer» B. difference | |
| 22. |
The resistance associated with the 1-mW power level is ________ , chosen because it is the characteristic impedance of audio transmission lines. |
| A. | 100 |
| B. | 250 |
| C. | 400 |
| D. | 600 |
| Answer» E. | |
| 23. |
The decibel (dB) is defined such that ________ decibel(s) = ________ bel(s). |
| A. | 1, 10 |
| B. | 10, 1 |
| C. | 1, 1 |
| D. | 10, 10 |
| Answer» C. 1, 1 | |
| 24. |
The logarithm of a number ________ than 1 is always ________. |
| A. | greater, negative |
| B. | less, positive |
| C. | less, negative |
| D. | None of the above |
| Answer» D. None of the above | |
| 25. |
Logarithms taken to the base ________ are referred to as common logarithms, while logarithms taken to the base ________ are referred to as natural logarithms. |
| A. | 10, e |
| B. | e, 10 |
| C. | 5, e |
| D. | 10, 5 |
| Answer» B. e, 10 | |
| 26. |
What is the range of the capacitor Cds? |
| A. | 0.01 to 0.1 pF |
| B. | 0.1 to 1 pF |
| C. | 0.1 to 1 nF |
| D. | 0.1 to 1 F |
| Answer» C. 0.1 to 1 nF | |
| 27. |
What is the range of the capacitors Cgs and Cgd? |
| A. | 1 to 10 pF |
| B. | 1 to 10 nF |
| C. | 1 to 10 F |
| D. | 1 to 10 F |
| Answer» B. 1 to 10 nF | |
| 28. |
A 3-dB drop in hfe will occur at a frequency defined by ________. |
| A. | [A]. |
| B. | [B]. |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 29. |
Which of the following capacitors is (are) included in Ci for the high-frequency region of a BJT or FET amplifier? |
| A. | Input wiring capacitance |
| B. | The transition capacitance () |
| C. | Miller capacitance |
| D. | All of the above |
| Answer» E. | |
| 30. |
In the hybrid or Giacoletto model, which one of the following does rb include? |
| A. | Base spreading resistance |
| B. | Base contact |
| C. | Base bulk |
| D. | All of the above |
| Answer» E. | |
| 31. |
Which of the low-frequency cutoffs determined by CS, CC, or CE will be the predominant factor in determining the low-frequency response for the complete system? |
| A. | lowest |
| B. | middle |
| C. | highest |
| D. | None of the above |
| Answer» D. None of the above | |
| 32. |
What is the ratio of the capacitive reactance XCS to the input resistance RI of the input RC circuit of a single-stage BJT amplifier at the low-frequency cutoff? |
| A. | 0.25 |
| B. | 0.5 |
| C. | 0.75 |
| D. | 1 |
| Answer» E. | |
| 33. |
logea = ________ log10a |
| A. | 2.3 |
| B. | 2.718 |
| C. | e |
| D. | 1.414 |
| Answer» B. 2.718 | |
| 34. |
What is the ratio of the output power to the input power at the cutoff frequencies in a normalized frequency response plot? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.707 |
| D. | 1 |
| Answer» C. 0.707 | |
| 35. |
In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage for frequencies much larger than the cutoff frequency in the low-frequency region? |
| A. | About 0º |
| B. | 45º |
| C. | About 90º |
| D. | None of the above |
| Answer» B. 45º | |
| 36. |
In the ________-frequency region, the capacitive elements of importance are the interelectrode (between terminals) capacitances internal to the active device and the wiring capacitance between the leads of the network. |
| A. | low |
| B. | mid |
| C. | high |
| D. | - |
| Answer» D. - | |
| 37. |
Which of the following capacitors is (are) included in C i for the high-frequency region of a BJT or FET amplifier? |
| A. | Input wiring capacitance |
| B. | The transition capacitance ( ) |
| C. | Miller capacitance |
| D. | All of the above |
| Answer» E. | |
| 38. |
A change in frequency by a factor of ________ is equivalent to 1 decade. |
| A. | 2 |
| B. | 10 |
| C. | 5 |
| D. | 20 |
| Answer» C. 5 | |
| 39. |
What is the ratio of the output voltage to the input voltage at the cutoff frequencies in a normalized frequency response plot? |
| A. | 0.25 |
| B. | 0.50 |
| C. | 0.707 |
| D. | 1 |
| Answer» D. 1 | |
| 40. |
Which of the following statements is true for a square-wave signal? |
| A. | It is composed of both even and odd harmonics. |
| B. | It is composed only of odd harmonics. |
| C. | It is composed only of even harmonics. |
| D. | The harmonics waveforms are also square waves. |
| Answer» C. It is composed only of even harmonics. | |
| 41. |
log e a = ________ log10 a |
| A. | 2.3 |
| B. | 2.718 |
| C. | e |
| D. | 1.414 |
| Answer» B. 2.718 | |
| 42. |
In the hybrid or Giacoletto model, which one of the following does r b include? |
| A. | Base spreading resistance |
| B. | Base contact |
| C. | Base bulk |
| D. | All of the above |
| Answer» E. | |
| 43. |
The ________-frequency response of a transformer-coupled system is calculated primarily by the stray capacitance between the turns of the primary and secondary windings. |
| A. | low |
| B. | mid |
| C. | high |
| D. | - |
| Answer» D. - | |
| 44. |
By what other name(s) are the cutoff frequencies in a frequency response plot called? |
| A. | Corner frequency |
| B. | Break frequency |
| C. | Half-power frequency |
| D. | All of the above |
| Answer» E. | |
| 45. |
What magnitude voltage gain corresponds to a decibel gain of 50? |
| A. | 31.6238 |
| B. | 316.228 |
| C. | 3162.38 |
| D. | 31623.8 |
| Answer» C. 3162.38 | |
| 46. |
Which of the following configurations does (do) not involve the Miller effect capacitance? |
| A. | Common-emitter |
| B. | Common-base |
| C. | Common-collector |
| D. | All of the above |
| Answer» C. Common-collector | |
| 47. |
What is the ratio of the common logarithm of a number to its natural logarithm? |
| A. | 0.435 |
| B. | 2 |
| C. | 2.3 |
| D. | 3.2 |
| Answer» D. 3.2 | |
| 48. |
Which of the low-frequency cutoffs determined by C S , C C , or C E will be the predominant factor in determining the low-frequency response for the complete system? |
| A. | lowest |
| B. | middle |
| C. | highest |
| D. | None of the above |
| Answer» D. None of the above | |
| 49. |
Determine the break frequency for this circuit. |
| A. | 15.915 Hz |
| B. | 159.15 Hz |
| C. | 31.85 Hz |
| D. | 318.5 Hz |
| Answer» C. 31.85 Hz | |
| 50. |
What is the normalized gain expressed in dB for the cutoff frequencies? |
| A. | –3 dB |
| B. | +3 dB |
| C. | –6 dB |
| D. | –20 dB |
| Answer» B. +3 dB | |