# Second Order Low Pass Butterworth Filter MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Second Order Low Pass Butterworth Filter”.

1. Consider the following specifications and calculate the high cut-off frequency for the circuit given?

a) 95Hz
b) 48Hz
c) 14Hz
d) 33Hz

2. Find the gain and phase angle of the second order low pass filter?
Where pass band gain of the filter is 5, frequency and the high cut-off frequency of the filter are 3000Hz and 1kHz.
a) None of the mentioned
b) Gain magnitude = -1.03dB , φ =63.32o
c) Gain magnitude = -5.19dB , φ =71.56o
d) Gain magnitude = -4.94dB , φ =90o

3. How can a first order low pass filter can be converted into second order low pass filter
c) By adding RC || LC network
d) None of the mentioned

4. Design a second order low pass butterworth filter at a high cut-off frequency of 2.2kHz. Given RF=20kΩ and capacitor 0.047µF.
a) b) c) d) 5. The pass band voltage gain of a second order low pass butterworth filter is
a) 1.586
b) 8.32
c) 0.586
d) 0.707

6. Frequency scaling is done using
a) Standard capacitor
b) Varying capacitor
c) Standard resistance
d) None of the mentioned

7. A second order low pass filter is given an input frequency of 30kHz and produce a output having phase angle of 79o. Determine the pass band gain of the filter?
a) 11 dB
b) 89.11 dB
c) 46.78 dB
d) None of the mentioned

8. Arrange the series of step involved in designing a filter for first order low pass filter
Step 1: Select a value of C less than or equal to 1µF
Step 2: Choose a value of high cut-off frequency fH
Step 3: Select a value of R1C and RF depending on the desired pass band gain
Step 4: Calculate the value of R
a) Steps- 2->4->3->1
b) Steps- 4->1->3->2
c) Steps- 2->1->4->3
d) Steps- 1->3->4->2 5 Star
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