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# Malvino: MCQ in Active Filters

This is the Multiple Choice Questions in Chapter 21: Active Filters from the book Electronic Principles 7th Edition by Albert Malvino. 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.

### Topic Outline

• MCQs in Ideal Responses
• MCQs in Approximate Response
• MCQs in Passive Filters
• MCQs in First-Order stages
• MCQs in VCVS Unity-Gain Second Order Low-Pass Filters
• MCQs in Higher-Order Filters
• MCQs in VCVS Equal-component Low-Pass Filters
• MCQs in VCVS High-Pass Filters
• MCQs in MFB Bandpass Filters
• MCQs in Bandstop Filters
• MCQs in All-Pass Filters
• MCQs in Biquadratic and State-Variable Filters

### Start Practice Exam Test Questions

Choose the letter of the best answer in each questions.

1. The region between the passband and the stopband is called the

• a. Attenuation
• b. Center
• c. Transition
• d. Ripple

2. The center frequency of a bandpass filter is always equal to

• a. The bandwidth
• b. Geometric average of the cutoff frequencies
• c. Bandwidth divided by Q
• d. 3-dB frequency

3. The Q of a narrowband filter is always

• a. small
• b. equal to BW divided by f0
• c. less than 1
• d. greater than 1

4. A bandstop filter is sometimes called a

• a. Snubber
• b. Phase shifter
• c. Notch filter
• d. Time-delay circuit

5. The all-pass filter has

• a. No passband
• b. One stopband
• c. the same gain at all frequencies
• d. a fast roll-off above cutoff

6. The approximation with a maximally-flat passband is

• a. Chebyshev
• b. Inverse Chebyshev
• c. Elliptic
• d. Bessel

7. The approximation with a rippled passband is

• a. Butterworth
• b. Inverse Chebyshev
• c. Elliptic
• d. Bessel

8. The approximation that distorts digital signals the least is the

• a. Butterworth
• b. Chebyshev
• c. Elliptic
• d. Bessel

9. If a filter has six second order stages and one first-order stage, the order is

• a. 2
• b. 6
• c. 7
• d. 13

10. If a Butterworth filter has 9 second-order stages, its roll-off rate is

• a. 20 dB per decade
• b. 40 dB per decade
• c. 180 dB per decade
• d. 360 dB per decade

11. If n = 10, the approximation with the fastest roll-off in the transition region is

• a. Butterworth
• b. Chebyshev
• c. Inverse Chebyshev
• d. Elliptic

12. The elliptic approximation has a

• a. Slow roll-off rate compared to the Cauer
• b. Rippled stopband
• c. Maximally-flat passband
• d. Monotonic stopband

13. Linear phase shift is equivalent to

• a. Q = 0.707
• b. Maximally-flat stopband
• c. Constant time delay
• d. Rippled passband

14. The filter with the slowest roll-off rate is the

• a. Butterworth
• b. Chebyshev
• c. Elliptic
• d. Bessel

15. A first-order active-filter stage has

• a. One capacitor
• b. Two op amps
• c. Three resistors
• d. a high Q

16. A first-order stage cannot have a

• a. Butterworth response
• b. Chebyshev response
• c. Maximally-flat passband
• d. Rolloff rate of 20 dB per decade

17. Sallen-Key filters are also called

• a. VCVS filters
• b. MFB filters
• c. Biquadratic filters
• d. State-variable filters

18. To build a 10th-order filter, we should cascade

• a. 10 first-stage stages
• b. 5 second-order stages
• c. 3 third-order stages
• d. 2 fourth-order stages

19. To get a Butterworth response with an 8th-order filter, the stages need to have

• a. Equal Q’s
• b. Unequal center frequencies
• c. Inductors
• d. Staggered Q’s

20. To get a Chebyshev response with a 12th-order filter, the stages need to have

• a. Equal Q’s
• b. Equal center frequencies
• c. Staggered bandwidths
• d. Staggered center frequencies and Q’s

21. The Q of a Sallen-Key second-order stage depends on the

• a. Voltage gain
• b. Center frequency
• c. Bandwidth
• d. GBW of the op amp

22. With Sallen-Key high-pass filters, the pole frequency must be

• a. Added to the K values
• b. Subtracted from the K values
• c. Multiplied by the K values
• d. Divided by the K values

23. If BW increases, the

• a. Center frequency decreases
• b. Q decreases
• c. Roll-off rate increases
• d. Ripples appear in the stopband

24. When Q is greater than 1, a bandpass filter should be built with

• a. Low-pass and high-pass stages
• b. MFB stages
• c. Notch stages
• d. All-pass stages

25. The all-pass filter is used when

• a. High roll-off rates are needed
• b. Phase shift is important
• c. A maximally-flat passband is needed
• d. A rippled stopband is important

26. A second-order all-pass filter can vary the output phase from

• a. 90 degrees to -90 degrees
• b. 0 degrees to -180 degrees
• c. 0 degrees to -360 degrees
• d. 0 degrees to -720 degrees

27. The all-pass filter is sometimes called a

• a. Tow-Thomas filter
• b. Delay equalizer
• c. KHN filter
• d. State-variable filter

28. The biquadratic filter

• a. Has low component sensitivity
• b. Uses three or more op amps
• c. Is also called Tow-Thomas filter
• d. All of the above

29. The state-variable filter

• a. Has a low-pass, high-pass, and bandpass output
• b. Is difficult to tune
• c. Has high component sensitivity
• d. Uses less than three op amps

30. If GBW is limited, the Q of the stage will

• a. Remain the same
• b. Double
• c. Decrease
• d. Increase

31. To correct for limited GBW, a designer may use

• a. A constant time delay
• b. Predistortion
• c. Linear phase shift
• d. A rippled passband

### Complete List of MCQ in Electronic Principles by Albert Malvino

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