All-Pass Filter MCQ [Free PDF] - Objective Question Answer for All-Pass Filter Quiz

1. How many types of band elimination filters are present

A. Three
B. Two
C. Four
D. None of the mentioned

Answer: B

Band-reject filters are also called as band elimination filters. They are classified into two types.

i) Wide band-reject filter and
ii) Narrow band-reject filter.

3. A narrow band-reject filter is commonly called as

A. Notch filter
B. Band step filter
C. Delay filter
D. All of the mentioned

Answer: A

A narrow band-reject filter is also called a notch filter because of its higher quality factor, Q (>10).

4. Find the expression for notch-out frequency?

A. f_N = 2πRC
B. f_N = 2π/RC
C. f_N = 1/2π×√(R/C.
D. f_N = 1/2πRC

Answer: D

The notch-out frequency is the frequency at which maximum attenuation occurs: it is given by f_N =1/2πRC.

5. 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

Answer: C

The passive twin T-network has a selectively low figure of merit. The Q of the network can be increased significantly if it is used with the voltage follower.

6. Find out the application in which a narrow band-reject filter can be used?

A. Embedded system
B. Biomedical instrument
C. Digital computer
D. None of the mentioned

Answer: B

Notch filters or narrow band-reject filters are used in biomedical instruments for eliminating undesired frequencies.

7. Find the application of the area where all-pass filters are used?

A. Cathode ray oscilloscope
B. Television
C. Telephone wire
D. None of the mentioned

Answer: C

When signals are transmitted in transmission lines like telephone wires, they undergo a phase change, all-pass filters are used to compensate for these phase changes.

8. Determine the output voltage for all the all-pass filters and express it in complex form?

A. V_O =V_in/ [(1-j2πfRC. /(1+ j2πfRC.].
B. V_O =V_in× [(1+j2πfRC. /(1- j2πfRC.].
C. V_O =V_in ×[(1- j2πfRC. /(1+ j2πfRC.].
D. None of the mentioned

Answer: C
The output voltage of the all-pass filter is given as

V_O =V_in× [(1-j2πfRC. /(1+j2πfRC.] .

9. Determine the input frequency for the all-pass filter with a phase angle of 62^o. 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

Answer: D

The phase angle is given as

Φ = -2tan^-1×(2πfRC.

=> f=-tanΦ/4πRC

=-tan(62^o)/(4π×3.3kΩ×4.7µF)

= -1.88/0.1948 =-9.65Hz.

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

A. -45^o
B. -180^o
C. -270^o
D. -90^o

Answer: D

Phase angle Φ

=-2tan^-1×(2πfRC/1)

= -2tan^-1×(2π×1kHz×16kΩ×0.01µF)

= -2tan^-1×(1.0048)=-90^o.

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