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Digital Signal Processing MCQs | Digital Signal Processing Objective Type Questions and Answers

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Free download in PDF Digital Signal Processing Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
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(21) The anti causal sequences have ______ components in the left hand sequences.
[A] Negative
[B] Positive
[C] Both a and b
[D] None of the above
Answer: Positive
(22) For an expanded power series method, the coefficients represent
[A] Positive values only
[B] Negative values only
[C] Inverse sequence values
[D] None of the above
Answer: Inverse sequence values

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(23) The IIR filter designing involves
[A] Designing of digital filter in analog domain and transforming into digital domain
[B] Designing of digital filter in digital domain and transforming into analog domain
[C] Designing of analog filter in analog domain and transforming into digital domain
[D] Designing of analog filter in digital domain and transforming into analog domain
Answer: Designing of digital filter in analog domain and transforming into digital domain
(24) The advantage of using the cascade form of realisation is

1) It has same number of poles and zeros as that of individual components

2) The number of poles is the product of poles of individual components

3) The number of zeros is the product of poles of individual components

4) Over all transfer function may be determined

[A] 1, 2 and 3 are correct
[B] 1 and 3 are correct
[C] 1 and 4 are correct
[D] None of the above
Answer: 1 and 4 are correct
(25) The cascade realisation of IIR systems involves

1) The transfer function broken into product of transfer functions

2) The transfer function divided into addition of transfer functions

3) Factoring the numerator and denominator polynomials

4) Derivatives of the transfer functions

[A] 1, 2 and 3 are correct
[B] 1 and 3 are correct
[C] 3 and 4 are correct
[D] All the four are correct
Answer: 1 and 3 are correct
(26) For a system function H(s) to be stable
[A] The poles lie in left half of the s plane
[B] The zeros lie in right half of the s plane
[C] The poles lie in right half of the s plane
[D] The zeros lie in left half of the s plane
Answer: The poles lie in left half of the s plane
(27) The filter that may not be realized by approximation of derivatives techniques are

1) Band pass filters

2) High pass filters

3) Low pass filters

4) Band reject filters

[A] 1, 2 and 3 are correct
[B] 2 and 4 are correct
[C] 2 and 3 are correct
[D] All the four are correct
Answer: 2 and 4 are correct
(28) In direct form for realisation of IIR filters,

1) Denominator coefficients are the multipliers in the feed forward paths

2) Multipliers in the feedback paths are the positives of the denominator coefficients

3) Numerator coefficients are the multipliers in the feed forward paths

4) Multipliers in the feedback paths are the negatives of the denominator coefficients

[A] 1, 2 and 3 are correct
[B] 1 and 2 are correct
[C] 3 and 4 are correct
[D] All the four are correct
Answer: 3 and 4 are correct
(29) A discrete time signal may be

1) Samples of a continuous signal

2) A time series which is a domain of integers

3) Time series of sequence of quantities

4) Amplitude modulated wave

[A] 1, 2 and 3 are correct
[B] 1 and 2 are correct
[C] 1 and 3 are correct
[D] All the four are correct
Answer: 1, 2 and 3 are correct
(30) The ROC of a system is the
[A] range of frequency for which the z transform exists
[B] range of frequency for which the signal gets transmitted
[C] range of z for which the z transform converges
[D] range in which the signal is free of noise
Answer: range of z for which the z transform converges
31 The several ways to perform an inverse Z transform are

1) Direct computation

2) Long division

3) Partial fraction expansion with table lookup

4) Direct inversio

[A] 1, 2 and 3 are correct
[B] 1 and 2 are correct
[C] 2 and 3 are correct
[D] All the four are correct
Answer: All the four are correct
32 The region of convergence of x/ (1+2x+x2) is
[A] Negative
[B] Positive
[C] 1
[D] None of these
Answer: 1
33 IIR filter design by approximation of derivatives has the limitations

1) Used only for transforming analog high pass filters

2) Used for band pass filters having smaller resonant frequencies

3) Used only for transforming analog low pass filters

4) Used for band pass filters having high resonant frequencies

[A] 1, 2 and 3 are correct
[B] 1 and 2 are correct
[C] 2 and 3 are correct
[D] All the four are correct
Answer: 2 and 3 are correct

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