Band-Reject and All-Pass Filters MCQ’s

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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)
Find the wide band-reject filter from the given diagram
b)
Find the summing amplifier from the given diagram
c)
Find the type of filter from the given diagram
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)
Find the 120Hzactive notch filter from the given diagram
b)
Find the notch frequency from of the given diagram
c)
Find the two 0.68µF capacitor from the given diagram
d)
Find the phase changes from the given diagram

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

Determine the angle for given circuit diagram

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?

Determine the relation between Vo and Vin if the positions of R and C are interchanged

a) Vin leads VO
b) Vin lags VO
c) VO leads Vin
d) VO leads Vin

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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