# MCQs in Active Filters

MCQs in Active Filters from the book Electronic Devices - Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd.

This is the Multiple Choice Questions in Active Filters from the book Electronic Devices - Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

### Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. 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

2. Which filter exhibits a linear phase characteristic?

• A. Bessel
• B. Butterworth
• C. Chebyshev
• D. all of the above

3. Which filter has a maximally flat response?

• A. Bessel
• B. Butterworth
• C. Chebyshev
• D. all of the above

4. Which filter exhibits the most rapid roll-off rate?

• A. Bessel
• B. Butterworth
• C. Chebyshev
• D. all of the above

5. A third-order filter will have a roll-off rate of

6. Refer to Figure 15-1. Identify the frequency response curve for a band-reject filter.

Figure 15-1

• A. a
• B. b
• C. c
• D. d

7. Refer to Figure 15-1. Identify the frequency response curve for a low-pass filter.

• A. a
• B. b
• C. c
• D. d

8. Refer to Figure 15-1. Identify the frequency response curve for a high-pass filter.

• A. a
• B. b
• C. c
• D. d

9. Refer to Figure 15-1. Identify the frequency response curve for a band-pass filter.

• A. a
• B. b
• C. c
• D. d

10. Refer to Figure 15-2(a). This is a _____ filter, and it has a cutoff frequency of _____.

Figure 15-2

• A. high-pass, 21 Hz
• B. low-pass, 21 Hz
• C. high-pass, 2.65 kHz
• D. low-pass, 2.65 kHz

11. Refer to Figure 15-2(b). 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

12. Refer to Figure 15-2(c). This is a _____ filter.

• A. band-pass
• B. band-stop
• C. high-pass
• D. low-pass

13. Refer to Figure 15-2(d). This circuit is known as a _____ filter, and the fc 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

14. Refer to Figure 15-2(b). RA = 2.2 kâ„¦ and RB = 1.2 kâ„¦. This filter is probably a

• A. Butterworth type.
• B. Bessel type.
• C. Chebyshev type.
• D. none of the above

15. Refer to Figure 15-2(c). The roll-off of this filter is about

16. Refer to Figure 15-2(a). The roll-off of the circuit shown is about

17. 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

18. Refer to Figure 15-3. This is a _____ filter.

Figure 15-3

• A. low-pass
• B. high-pass
• C. band-pass
• D. band-stop

19. Refer to Figure 15-3. This filter has a roll-off rate of

20. Refer to Figure 15-3. Increasing the values of the filter section resistors in this circuit will cause the fc to

• A. increase.
• B. decrease.
• C. remain the same.
• D. increase and then decrease.

21. The bandwidth in a _____ filter equals the critical frequency.

• A. low-pass
• B. high-pass
• C. band-pass
• D. band-stop

22. A _____ filter significantly attenuates all frequencies below fc and passes all frequencies above fc.

• A. low-pass
• B. high-pass
• C. band-pass
• D. band-stop

23. 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

24. 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

25. 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. none of the above

26. 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. none of the above

27. Filters with the _____ characteristic are used for filtering pulse waveforms.

• A. Butterworth
• B. Chebyshev
• C. Bessel
• D. none of the above

28. The gain of the multiple-feedback band-pass filter above is equal to which of the following? Assume C = C1 = C2.

• A. A0 = R2 / R1
• B. A0 = R1 / R2
• C. A0 = R2 / 2 R1
• D. A0 = R1 / 2 R2

29. 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

#### TRUE/FALSE

1. The bandwidth of a band-pass filter is the sum of the two cutoff frequencies.

• A. True
• B. False

2. Butterworth filters have the characteristic of a very flat response in the passband and a roll-off of –20 dB/decade.

• A. True
• B. False

3. Filters with Bessel characteristics are used for filtering pulse waveforms.

• A. True
• B. False

4. In filters, a single RC network is called a pole.

• A. True
• B. False

5. A band-pass filter passes all frequencies within a band between a lower and an upper cutoff frequency.

• A. True
• B. False

6. The bandwidth of a practical high-pass filter is infinite.

• A. True
• B. False

7. A second-order filter has a roll-off of –20 dB/decade.

• A. True
• B. False

8. A Sallen-Key filter is a second-order filter.

• A. True
• B. False

9. An active filter uses capacitors and inductors in the feedback network.

• A. True
• B. False

10. A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.

• A. True
• B. False

### Complete List of Chapter MCQs in Floyd's Electronic Devices

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