This set of Digital Signal Processing aptitude tests focuses on “Characteristics of Commonly Used Analog Filters”.

1. Low pass Butterworth filters are also called as _____________

a) All-zero filter**b) All-pole filter**

c) Pole-zero filter

d) None of the mentioned

2. What is the equation for magnitude square response of a low pass Butterworth filter?**a) 11+(ΩΩC)2N√**

b) 1+(ΩΩC)2N

c) 1+(ΩΩC)2N−−−−−−−−−√

d) None of the mentioned

3. What is the transfer function of magnitude squared frequency response of the normalized low pass Butterworth filter?

a) 11+(s/j)−2N

b) 1+(sj)−2N

c) 1+(sj)2N**d) 11+(sj)2N**

4. Which of the following is the band edge value of |H(Ω)|^{2}?

a) (1+ε^{2})

b) (1-ε^{2})**c) 1/(1+ε ^{2})**

d) 1/(1-ε

^{2})

5. The magnitude square response shown in the below figure is for which of the following given filters?**a) Butterworth**

b) Chebyshev

c) Elliptical

d) None of the mentioned

6. What is the order of a low pass Butterworth filter that has a -3dB bandwidth of 500Hz and an attenuation of 40dB at 1000Hz?

a) 4

b) 5

c) 6**d) 7**

.

7. Which of the following is true about type-1 chebyshev filter?

a) Equi-ripple behavior in pass band

b) Monotonic characteristic in stop band**c) Equi-ripple behavior in pass band & Monotonic characteristic in stop band**

d) None of the mentioned

8. Type-2 chebyshev filters consists of ______________

a) Only poles**b) Both poles and zeros**

c) Only zeros

d) Cannot be determined

9. Which of the following is false about the type-2 chebyshev filters?

a) Monotonic behavior in the pass band

b) Equi-ripple behavior in the stop band

c) Zero behavior**d) Monotonic behavior in the stop band**

band.

10. The zeros of type-2 class of chebyshev filters lies on ___________**a) Imaginary axis**

b) Real axis

c) Zero

d) Cannot be determined

11. Which of the following defines a chebyshev polynomial of order N, T_{N}(x)?

a) cos(Ncos^{-1}x) for all x

b) cosh(Ncosh^{-1}x) for all x**c)**

cos(Ncos^{-1}x), |x|≤1 cosh(Ncosh^{-1}x), |x|>1

d) None of the mentioned

12. The frequency response shown in the figure below belongs to which of the following filters?

a) Type-1 chebyshev**b) Type-2 chebyshev**

c) Butterworth

d) Elliptical

13. What is the order of the type-2 chebyshev filter whose magnitude square response is as shown in the following figure?

a) 2

b) 4

c) 6**d) 3**

14. Which of the following is true about the magnitude square response of an elliptical filter?

a) Equi-ripple in pass band

b) Equi-ripple in stop band**c) Equi-ripple in pass band and stop band**

d) None of the mentioned

15. Bessel filters exhibit a linear phase response over the pass band of the filter.**a) True**

b) False