# Band-Reject and All-Pass Filters MCQ’s

This set of Signals & Systems Multiple Choice Questions & Answers (MCQs) focuses on “Band-Reject and All-Pass Filters”.

1. Find the wide band-reject filter.
a)

b)

c)

d) None of the mentioned

2. A narrow band-reject filter is commonly called as
a) Notch filter
b) Band step filter
c) Delay filter
d) All of the mentioned

3. How many types of band elimination filters are present
a) Three
b) Two
c) Four
d) None of the mentioned

4. Find the expression for notch-out frequency?
a) fN = 2πRC
b) fN = 2π/RC
c) fN = 1/2π×√(R/C)
d) fN = 1/2πRC

5. Find out the application in which narrow band-reject filter can be used?
a) Embedded system
b) Biomedical instrument
c) Digital computer
d) None of the mentioned

6. Find the application of area where all-pass filters are used?
a) Cathode ray oscilloscope
b) Television
c) Telephone wire
d) None of the mentioned

7. The quality factor of passive twin T-network is increased by using
a) Inverting amplifier
b) Non-inverting amplifier
c) Voltage follower
d) Differential amplifier

8. Design 120Hzactive notch filter?
a)

b)

c)

d)

9. Determine the output voltage for all the all-pass filter and express it in complex form?
a) VO =Vin/ [(1-j2πfRC) /(1+ j2πfRC)].
b) VO =Vin× [(1+j2πfRC) /(1- j2πfRC)].
c) VO =Vin ×[(1- j2πfRC) /(1+ j2πfRC)].
d) None of the mentioned

10. Determine the angle for given circuit diagram, if the frequency of input signal is 1khz

a) -45o
b) -180o
c) -270o
d) -90o

11. What happens if the position of R and C are interchanged in the below circuit diagram?

b) Vin lags VO

12. Determine the input frequency for all-pass filter with phase angle as 62o. Consider the value of resistor and capacitor are 3.3kΩ and 4.7µF.
a) Input frequency= -7.65Hz
b) Input frequency= -6.77Hz
c) Input frequency= -3.89Hz
d) Input frequency= -9.65Hz

13. The voltage gain magnitude of all-pass filter is
a) Zero
b) One
c) Infinity
d) None of the mentioned

14. Choose the incorrect statement “In wide band-reject filter” .
a) Low cut-off frequency of low pass filter must be larger than the high cut-off frequency of the high pass filter.
b) Low cut-off frequency of high pass filter must be equal than the high cut-off frequency of the high pass filter.
c) Low cut-off frequency of high pass filter must be smaller than the high cut-off frequency of the low pass filter.
d) None of the mentioned

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