# Floyd: MCQ in Active Filters

(Last Updated On: December 9, 2019) 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.

If you are looking for the Self-test in Floyd’s Electronic Devices proceed to

#### 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

Solution:

2. Which filter exhibits a linear phase characteristic?

A. Bessel

B. Butterworth

C. Chebyshev

D. all of the above

Solution:

3. Which filter has a maximally flat response?

A. Bessel

B. Butterworth

C. Chebyshev

D. all of the above

Solution:

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

A. Bessel

B. Butterworth

C. Chebyshev

D. all of the above

Solution:

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

Solution:

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

Solution:

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

A. a

B. b

C. c

D. d

Solution:

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

A. a

B. b

C. c

D. d

Solution:

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

A. a

B. b

C. c

D. d

Solution:

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

Solution:

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

Solution:

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

A. band-pass

B. band-stop

C. high-pass

D. low-pass

Solution:

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

Solution:

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

A. Butterworth type.

B. Bessel type.

C. Chebyshev type.

D. none of the above

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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.

Solution:

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

A. low-pass

B. high-pass

C. band-pass

D. band-stop

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

Solution:

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

A. Butterworth

B. Chebyshev

C. Bessel

D. none of the above

Solution:

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 = R2/2R1

D. A0 = R1/2R2

Solution:

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

Solution:

#### TRUE/FALSE

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

A. True

B. False

Solution:

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

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

Solution:

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

A. True

B. False

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