In this section of Electronic Devices and Circuits.It contain Active Filters MCQs (Multiple Choice Questions Answers).All the MCQs (Multiple Choice Question Answers) requires in depth reading of Electronic Devices and Circuits Subject as the hardness level of MCQs have been kept to advance level.These Sets of Questions are very helpful in Preparing for various Competitive Exams and University level Exams.
This Section Covers below lists of topics :
- Ideal Responses MCQs
- Approximate Response MCQs
- Passive Filters MCQs
- First-Order stages MCQs
- VCVS Unity-Gain Second Order Low-Pass Filters MCQs
- Higher-Order Filters MCQs
- VCVS Equal-component Low-Pass Filters MCQs
- VCVS High-Pass Filters MCQs
- MFB Bandpass Filters MCQs
- Bandstop Filters MCQs
- All-Pass Filters MCQs
- Biquadratic and State-Variable Filters MCQs
Practice it now to sharpen your concept.
PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE
1. The region between the passband and the stopband is called the
- Attenuation
- Center
- Transition
- Ripple
C. Transition
2. The center frequency of a bandpass filter is always equal to
- The bandwidth
- Geometric average of the cutoff frequencies
- Bandwidth divided by Q
- 3-dB frequency
B. Geometric average of the cutoff frequencies
3. The Q of a narrowband filter is always
- small
- equal to BW divided by f0
- less than 1
- greater than 1
D. greater than 1
4. A bandstop filter is sometimes called a
- Snubber
- Phase shifter
- Notch filter
- Time-delay circuit
C. Notch filter
5. The all-pass filter has
- No passband
- One stopband
- the same gain at all frequencies
- a fast roll-off above cutoff
C. the same gain at all frequencies
6. The approximation with a maximally-flat passband is
- Chebyshev
- Inverse Chebyshev
- Elliptic
- Bessel
B. Inverse Chebyshev
7. The approximation with a rippled passband is
- Butterworth
- Inverse Chebyshev
- Elliptic
- Bessel
C. Elliptic
8. The approximation that distorts digital signals the least is the
- Butterworth
- Chebyshev
- Elliptic
- Bessel
D. Bessel
9. If a filter has six second order stages and one first-order stage, the order is
- 2
- 6
- 7
- 13
D. 13
10. If a Butterworth filter has 9 second-order stages, its roll-off rate is
- 20 dB per decade
- 40 dB per decade
- 180 dB per decade
- 360 dB per decade
D. 360 dB per decade
11. If n = 10, the approximation with the fastest roll-off in the transition region is
- Butterworth
- Chebyshev
- Inverse Chebyshev
- Elliptic
D. Elliptic
12. The elliptic approximation has a
- Slow roll-off rate compared to the Cauer
- Rippled stopband
- Maximally-flat passband
- Monotonic stopband
B. Rippled stopband
13. Linear phase shift is equivalent to
- Q = 0.707
- Maximally-flat stopband
- Constant time delay
- Rippled passband
C. Constant time delay
14. The filter with the slowest roll-off rate is the
- Butterworth
- Chebyshev
- Elliptic
- Bessel
D. Bessel
15. A first-order active-filter stage has
- One capacitor
- Two op amps
- Three resistors
- a high Q
A. One capacitor
16. A first-order stage cannot have a
- Butterworth response
- Chebyshev response
- Maximally-flat passband
- Rolloff rate of 20 dB per decade
B. Chebyshev response
17. Sallen-Key filters are also called
- VCVS filters
- MFB filters
- Biquadratic filters
- State-variable filters
A. VCVS filters
18. To build a 10th-order filter, we should cascade
- 10 first-stage stages
- 5 second-order stages
- 3 third-order stages
- 2 fourth-order stages
B. 5 second-order stages
19. To get a Butterworth response with an 8th-order filter, the stages need to have
- Equal Q’s
- Unequal center frequencies
- Inductors
- Staggered Q’s
D. Staggered Q’s
20. To get a Chebyshev response with a 12th-order filter, the stages need to have
- Equal Q’s
- Equal center frequencies
- Staggered bandwidths
- Staggered center frequencies and Q’s
D. Staggered center frequencies and Q’s
21. The Q of a Sallen-Key second-order stage depends on the
- Voltage gain
- Center frequency
- Bandwidth
- GBW of the op amp
A. Voltage gain
22. With Sallen-Key high-pass filters, the pole frequency must be
- Added to the K values
- Subtracted from the K values
- Multiplied by the K values
- Divided by the K values
D. Divided by the K values
23. If BW increases, the
- Center frequency decreases
- Q decreases
- Roll-off rate increases
- Ripples appear in the stopband
B. Q decreases
24. When Q is greater than 1, a bandpass filter should be built with
- Low-pass and high-pass stages
- MFB stages
- Notch stages
- All-pass stages
B. MFB stages
25. The all-pass filter is used when
- High roll-off rates are needed
- Phase shift is important
- A maximally-flat passband is needed
- A rippled stopband is important
B. Phase shift is important
26. A second-order all-pass filter can vary the output phase from
- 90 degrees to -90 degrees
- 0 degrees to -180 degrees
- 0 degrees to -360 degrees
- 0 degrees to -720 degrees
C. 0 degrees to -360 degrees
27. The all-pass filter is sometimes called a
- Tow-Thomas filter
- Delay equalizer
- KHN filter
- State-variable filter
B. Delay equalizer
28. The biquadratic filter
- Has low component sensitivity
- Uses three or more op amps
- Is also called Tow-Thomas filter
- All of the above
D. All of the above
29. The state-variable filter
- Has a low-pass, high-pass, and bandpass output
- Is difficult to tune
- Has high component sensitivity
- Uses less than three op amps
A. Has a low-pass, high-pass, and bandpass output
30. If GBW is limited, the Q of the stage will
- Remain the same
- Double
- Decrease
- Increase
D. Increase
31. To correct for limited GBW, a designer may use
- A constant time delay
- Predistortion
- Linear phase shift
- A rippled passband
B. Predistortion
