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Digital Signal Processing – Multiple Choice Questions (MCQs)

25. A system with poles outside the unit circle in the z-plane is:
- A. Stable
- B. Unstable
- C. Marginally stable
- D. Non-causal
26. A system with poles exactly on the unit circle in the z-plane (and no multiple poles there) is:
- A. Stable
- B. Unstable
- C. Marginally stable
- D. Non-causal
27. The power spectral density (PSD) of a discrete-time random process is the Discrete-Time Fourier Transform (DTFT) of its:
- A. Autocorrelation function
- B. Probability density function
- C. Mean
- D. Variance
28. The output of a discrete-time system at any instant depends only on the current and past inputs. Such a system is:
- A. Non-causal
- B. Causal
- C. Unstable
- D. Memoryless
29. The Nyquist interval is the time interval between successive samples
- A. given by:
- B. 1/fm
- C. 1/(2fm)
- D. 2fm
30. Quantization noise is introduced during the process of:
- A. Sampling
- B. Quantization
- C. Encoding
- D. Filtering
31. The number of bits used in quantization directly affects the:
- A. Sampling rate
- B. Quantization error
- C. Bandwidth
- D. Computational complexity
32. The Discrete-Time Fourier Series (DTFS) is used to represent:
- A. Aperiodic discrete-time signals
- B. Periodic discrete-time signals
- C. Continuous-time signals
- D. Random signals
33. The relationship between DTFT and DFT is that DFT is a ________ version of DTFT.
- A. Sampled
- B. Continuous
- C. Analog
- D. Inverse
34. Zero padding in DFT is performed to:
- A. Increase frequency resolution
- B. Decrease frequency resolution
- C. Reduce aliasing
- D. Improve time domain representation
35. The circular convolution of two N-point sequences is equivalent to the linear convolution if both sequences are padded with zeros to a length of at least:
- A. N
- B. N-1
- C. 2N-1
- D. N+1
36. The overlap-add and overlap-save methods are used for efficient computation of:
- A. Linear convolution using DFT
- B. Circular convolution using DFT
- C. Linear phase FIR filters
- D. IIR filter design

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Digital Signal Processing – Multiple Choice Questions (MCQs)

25. A system with poles outside the unit circle in the z-plane is:

26. A system with poles exactly on the unit circle in the z-plane (and no multiple poles there) is:

27. The power spectral density (PSD) of a discrete-time random process is the Discrete-Time Fourier Transform (DTFT) of its:

28. The output of a discrete-time system at any instant depends only on the current and past inputs. Such a system is:

29. The Nyquist interval is the time interval between successive samples

30. Quantization noise is introduced during the process of:

31. The number of bits used in quantization directly affects the:

32. The Discrete-Time Fourier Series (DTFS) is used to represent:

33. The relationship between DTFT and DFT is that DFT is a ________ version of DTFT.

34. Zero padding in DFT is performed to:

35. The circular convolution of two N-point sequences is equivalent to the linear convolution if both sequences are padded with zeros to a length of at least:

36. The overlap-add and overlap-save methods are used for efficient computation of:

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