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Digital Signal Processing Questions and Answers | Digital Signal Processing MCQs

Free download in PDF Digital Signal Processing Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Is IIR Filter design by Bilinear Transformation is the advanced technique when compared to other design techniques?
[A] True
[B] False
Answer: True
(2) In the Bilinear Transformation mapping, which of the following are correct?
[A] All points in the LHP of s are mapped inside the unit circle in the z-plane
[B] All points in the RHP of s are mapped outside the unit circle in the z-plane
[C] All points in the LHP & RHP of s are mapped inside & outside the unit circle in the z-plane
[D] None of the mentioned
Answer: All points in the LHP & RHP of s are mapped inside & outside the unit circle in the z-plane
(3) Which of the following is a frequency domain specification?
[A] 0 ≥ 20 log|H(jΩ)|
[B] 20 log|H(jΩ)| ≥ KP
[C] 20 log|H(jΩ)| ≤ KS
[D] All of the mentioned
Answer: All of the mentioned
(4) The cutoff frequency of the low pass Butterworth filter is the arithmetic mean of the two cutoff frequencies as found above.
[A] True
[B] False
Answer: True
(5) What is the lowest order of the Butterworth filter with a pass band gain KP=-1 dB at ΩP=4 rad/sec and stop band attenuation greater than or equal to 20dB at ΩS = 8 rad/sec?
[A] 4
[B] 5
[C] 6
[D] 3
Answer: 5
(6) What is the cutoff frequency of the Butterworth filter with a pass band gain KP=-1 dB at ΩP=4 rad/sec and stop band attenuation greater than or equal to 20dB at ΩS=8 rad/sec?
[A] 3.5787 rad/sec
[B] 1.069 rad/sec
[C] 6 rad/sec
[D] 4.5787 rad/sec
Answer: 4.5787 rad/sec
(7) What is the stop band frequency of the normalized low pass Butterworth filter used to design a analog band pass filter with -3.0103dB upper and lower cutoff frequency of 50Hz and 20KHz and a stop band attenuation 20dB at 20Hz and 45KHz?
[A] 2 rad/sec
[B] 2.25 Hz
[C] 2.25 rad/sec
[D] 2 Hz
Answer: 2.25 rad/sec
(8) What is the order of the normalized low pass Butterworth filter used to design a analog band pass filter with -3.0103dB upper and lower cutoff frequency of 50Hz and 20KHz and a stop band attenuation 20dB at 20Hz and 45KHz?
[A] 2
[B] 3
[C] 4
[D] 5
Answer: 3
(9) Which of the following defines a chebyshev polynomial of order N, TN(x)?
[A] cos(Ncos-1x) for all x
[B] cosh(Ncosh-1x) for all x
[C] cos(Ncos-1x), |x|<1 
cosh(Ncosh-1x), |x|>1
[D] None of the mentioned
Answer: cos(Ncos-1x), |x|<1 
cosh(Ncosh-1x), |x|>1
(10) What is the formula for chebyshev polynomial TN(x) in recursive form?
[A] 2TN-1(x) – TN-2(x)
[B] 2TN-1(x) + TN-2(x)
[C] 2xTN-1(x) + TN-2(x)
[D] 2xTN-1(x) – TN-2(x)
Answer: 2xTN-1(x) – TN-2(x)
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