# First & Second-Order High Pass Butterworth Filter and Higher Order Filters MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “First & Second-Order High Pass Butterworth Filter and Higher Order Filters”.

1. In a first order high pass filter, frequencies higher than low cut-off frequencies are called
a) Stop band frequency
b) Pass band frequency
c) Centre band frequency
d) None of the mentioned

2. Compute the voltage gain for the following circuit with input frequency 1.5kHz.

a) 4dB
b) 15dB
c) 6dB
d) 12dB

3. How is the higher order filters formed?
a) By increasing resistors and capacitors in low pass filter
b) By decreasing resistors and capacitors in low pass filter
c) By inter changing resistors and capacitors in low pass filter
d) All of the mentioned

4. Determine the expression for output voltage of first order high pass filter?
a) VO = [1+(RF /R1)]× [(j2πfRC/(1+j2πfRC)] × Vin
b) VO = [-(RF /R1)]× [(j2πfRC/(1+j2πfRC)] × Vin
c) VO = {[1+(RF /R1)]× /[1+j2πfRC] }× Vin
d) None of the mentioned

5. Consider the following circuit and calculate the low cut-off frequency value?

a) 178.7Hz
b) 89.3Hz
c) 127.65Hz
d) 255.38Hz

6. From the given specifications, determine the value of voltage gain magnitude of first order and second order high pass butterworth filter?
Pass band voltage gain=2;
Low cut-off frequency= 1kHz;
Input frequency=500Hz.
a) First order high pass filter =-4.22dB , Second order high pass filter=-0.011dB
b) First order high pass filter =-0.9688dB , Second order high pass filter=-6.28dB
c) First order high pass filter =-11.3194dB , Second order high pass filter=-9.3257dB
d) First order high pass filter =-7.511dB , Second order high pass filter=-5.8999dB

7. The internal resistor of the second order high pass filter is equal to 10kΩ. Find the value of feedback resistor?
a) 6.9kΩ
b) 5.86kΩ
c) 10kΩ
d) 12.56kΩ

8. Determine voltage gain of second order high pass butterworth filter.
Specifications R3 =R2=33Ω, f=250hz and fL=1khz.
a) -11.78dB
b) -26.51dB
c) -44.19dB
d) None of the mentioned

9. How is the higher order filters formed?
a) Using first order filter
b) Using second order filter
c) Connecting first and second order filter in series
d) Connecting first and second order filter in parallel

10. The overall gain of higher order filter is
a) Varying
b) Fixed
c) Random
d) None of the mentioned

11. State the disadvantage of using higher order filters?
a) Complexity
b) Requires more space
c) Expensive
d) All of the mentioned

12. Find the roll-off rate for 8th order filter

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