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MCQOPTIONS
This section includes 41 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 approximation that distorts digital signals the least is the |
| A. | Chebyshev |
| B. | Butterworth |
| C. | Bessel |
| D. | Elliptic |
| Answer» D. Elliptic | |
| 2. |
In the operation of dry cells, we normally refer to the supply of current to load resistance where its current neutralizes the separated charges at the electrodes as ________? |
| A. | charging the cells |
| B. | aligning the cells |
| C. | polarizing the cells |
| D. | discharging the cells |
| Answer» D. discharging the cells | |
| 3. |
What do you call the ratio between the intensity of magnetization produced in a substance, to the source of magnetizing force? |
| A. | Magnetic conductivity |
| B. | Magnetic resistivity |
| C. | Magnetic reluctivity |
| D. | Magnetic susceptibility |
| Answer» E. | |
| 4. |
The region between the passband and the stopband is called the |
| A. | Center |
| B. | Attenuation |
| C. | Ripple |
| D. | Transition |
| Answer» E. | |
| 5. |
A first-order active-filter stage has |
| A. | Two op amps |
| B. | One capacitor |
| C. | a high Q |
| D. | Three resistors |
| Answer» C. a high Q | |
| 6. |
What type of bias is required for an LED to produce luminescence? |
| A. | Forward bias |
| B. | Reverse bias |
| C. | Inductive bias |
| D. | Zero bias |
| Answer» E. | |
| 7. |
The all-pass filter is sometimes called a |
| A. | Delay equalizer |
| B. | Tow-Thomas filter |
| C. | State-variable filter |
| D. | KHN filter |
| Answer» B. Tow-Thomas filter | |
| 8. |
To get a Chebyshev response with a 12th-order filter, the stages need to have |
| A. | Equal center frequencies |
| B. | Equal Q's |
| C. | Staggered center frequencies and Q's |
| D. | Staggered bandwidths |
| Answer» D. Staggered bandwidths | |
| 9. |
If a filter has six second-order stages and one first-order stage, the order is |
| A. | 6 |
| B. | 2 |
| C. | 13 |
| D. | 7 |
| Answer» D. 7 | |
| 10. |
What is the other name or relative permittivity? |
| A. | Breakdown voltage |
| B. | Dielectric strength |
| C. | Potential gradient |
| D. | Specific inductive capacity |
| Answer» E. | |
| 11. |
If GBW is limited, the Q of the stage will |
| A. | Double |
| B. | Remain the same |
| C. | Increase |
| D. | Decrease |
| Answer» D. Decrease | |
| 12. |
If BW increases, the |
| A. | Q decreases |
| B. | Center frequency decreases |
| C. | Ripples appear in the stopband |
| D. | Rolloff rate increases |
| Answer» B. Center frequency decreases | |
| 13. |
A ________ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» D. band-stop | |
| 14. |
A third-order filter will have a roll-off rate of |
| A. | –20 dB/decade. |
| B. | –40 dB/decade. |
| C. | –60 dB/decade. |
| D. | –30 dB/decade. |
| Answer» D. –30 dB/decade. | |
| 15. |
Refer to this figure. This filter has a roll-off rate of |
| A. | 20 dB/decade. |
| B. | 40 dB/decade. |
| C. | 60 dB/decade. |
| D. | 80 dB/decade. |
| Answer» E. | |
| 16. |
Identify the frequency response curve for a band-reject filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 17. |
Refer to the given figure. R A = 2.2 k and R B = 1.2 k . This filter is probably a |
| A. | Butterworth type. |
| B. | Bessel type. |
| C. | Chebyshev type. |
| D. | - |
| Answer» B. Bessel type. | |
| 18. |
Refer to the given figure. This is a ________ filter, and it has a cutoff frequency of ________. |
| A. | high-pass, 21 Hz |
| B. | low-pass, 21 Hz |
| C. | high-pass, 2.65 kHz |
| D. | low-pass, 2.65 kHz |
| Answer» D. low-pass, 2.65 kHz | |
| 19. |
One important application of a state-variable ________ filter with a summing amplifier is to minimize the 60 Hz "hum" in audio systems. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» E. | |
| 20. |
Refer to this figure. Increasing the values of the filter section resistors in this circuit will cause the f c to |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| D. | increase and then decrease. |
| Answer» C. remain the same. | |
| 21. |
A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter. |
| A. | 2.46 kHz |
| B. | 1.23 kHz |
| C. | 644 Hz |
| D. | not enough information given |
| Answer» C. 644 Hz | |
| 22. |
Refer to the given figure. This is a ________ filter. |
| A. | band-pass |
| B. | band-stop |
| C. | high-pass |
| D. | low-pass |
| Answer» B. band-stop | |
| 23. |
Identify the frequency response curve for a low-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 24. |
Identify the frequency response curve for a high-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 25. |
Which filter has a maximally flat response? |
| A. | Bessel |
| B. | Butterworth |
| C. | Chebyshev |
| D. | all of the above |
| Answer» C. Chebyshev | |
| 26. |
Which filter exhibits the most rapid roll-off rate? |
| A. | Bessel |
| B. | Butterworth |
| C. | Chebyshev |
| D. | all of the above |
| Answer» D. all of the above | |
| 27. |
Filters with the ________ characteristic provide a very flat amplitude in the passband and a roll-off rate of –20 dB/decade/pole. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| D. | - |
| Answer» B. Chebyshev | |
| 28. |
The critical frequency is defined as the point at which the response drops ________ from the passband. |
| A. | –20 dB |
| B. | –3 dB |
| C. | –6 dB |
| D. | –40 dB |
| Answer» C. –6 dB | |
| 29. |
Refer to the given figure. The cutoff frequency of this filter is ________, and the circuit is known as a ________. |
| A. | 721 Hz, low-pass filter |
| B. | 721 Hz, high-pass filter |
| C. | 72 Hz, low-pass filter |
| D. | 721 Hz, band-pass filter |
| Answer» B. 721 Hz, high-pass filter | |
| 30. |
Which filter exhibits a linear phase characteristic? |
| A. | Bessel |
| B. | Butterworth |
| C. | Chebyshev |
| D. | all of the above |
| Answer» B. Butterworth | |
| 31. |
Refer to this figure. This is a ________ filter. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» C. band-pass | |
| 32. |
Refer to the given figure. The roll-off of the circuit shown is about |
| A. | 20 dB/decade. |
| B. | 40 dB/decade. |
| C. | 60 dB/decade. |
| D. | 80 dB/decade. |
| Answer» B. 40 dB/decade. | |
| 33. |
Refer to the given figure. The roll-off of this filter is about |
| A. | 20 dB/decade. |
| B. | 40 dB/decade. |
| C. | 60 dB/decade. |
| D. | 80 dB/decade. |
| Answer» B. 40 dB/decade. | |
| 34. |
The bandwidth in a ________ filter equals the critical frequency. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» B. high-pass | |
| 35. |
Filters with the ________ characteristic are used for filtering pulse waveforms. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| D. | - |
| Answer» D. - | |
| 36. |
Refer to the given figure. This circuit is known as a ________ filter, and the f c is ________. |
| A. | high-pass, 1.59 kHz |
| B. | band-pass, 15.9 kHz |
| C. | low-pass, 15.9 kHz |
| D. | high-pass, 15.9 kHz |
| Answer» E. | |
| 37. |
The gain of the multiple-feedback band-pass filter above is equal to which of the following? Assume C = C 1 = C 2 . |
| A. | A 0 = R 2 / R 1 |
| B. | A 0 = R 1 / R 2 |
| C. | A 0 = R 2 / 2 R 1 |
| D. | A 0 = R 1 / 2 R 2 |
| Answer» D. A 0 = R 1 / 2 R 2 | |
| 38. |
A ________ filter significantly attenuates all frequencies below f c and passes all frequencies above f c . |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» C. band-pass | |
| 39. |
Identify the frequency response curve for a band-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 40. |
Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than –20/dB/decade/pole. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| D. | - |
| Answer» C. Bessel | |
| 41. |
A ________ filter rejects all frequencies within a specified band and passes all those outside this band. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» E. | |