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Digital Signal Processing – Multiple Choice Questions (MCQs)

1. The process of converting a continuous-time signal into a discrete-time signal is called:
- A. Quantization
- B. Encoding
- C. Sampling
- D. Modulation
2. The Nyquist rate for sampling a continuous-time signal with maximum frequency fm is:
- A. fm
- B. 2fm
- C. fm/2
- D. 4fm
3. Aliasing occurs when the sampling frequency is:
- A. Greater than Nyquist rate
- B. Less than Nyquist rate
- C. Equal to Nyquist rate
- D. Zero
4. The process of representing sampled signal amplitudes by a finite set of levels is called:
- A. Sampling
- B. Quantization
- C. Encoding
- D. Filtering
5. The Z-Transform is primarily used for the analysis of:
- A. Continuous-time signals
- B. Discrete-time signals
- C. Analog signals
- D. Random signals
6. The Z-Transform of a unit impulse sequence δ[n] is:
- A. 1
- B. z
- C. 1/z
- D. z^-1
7. The Z-Transform of a unit step sequence u[n] is:
- A. z / (z-1)
- B. 1 / (z-1)
- C. z / (z+1)
- D. 1 / (z+1)
8. A causal discrete-time LTI system has all its poles located:
- A. Outside the unit circle
- B. Inside the unit circle
- C. On the unit circle
- D. At the origin
9. The Discrete Fourier Transform (DFT) is used to analyze signals in the:
- A. Time domain
- B. Frequency domain
- C. Spatial domain
- D. Z-domain
10. The Fast Fourier Transform (FFT) algorithm reduces the computational complexity of DFT from O(N²) to:
- A. O(N)
- B. O(N log N)
- C. O(log N)
- D. O(N³)
11. Which of the following describes an FIR (Finite Impulse Response) filter?
- A. Its impulse response is infinite
- B. It has feedback
- C. It has poles only at the origin
- D. Its impulse response is finite
12. Which of the following describes an IIR (Infinite Impulse Response) filter?
- A. Its impulse response is finite
- B. It has no feedback
- C. It has only zeros
- D. Its impulse response is infinite

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Digital Signal Processing – Multiple Choice Questions (MCQs)

1. The process of converting a continuous-time signal into a discrete-time signal is called:

2. The Nyquist rate for sampling a continuous-time signal with maximum frequency fm is:

3. Aliasing occurs when the sampling frequency is:

4. The process of representing sampled signal amplitudes by a finite set of levels is called:

5. The Z-Transform is primarily used for the analysis of:

6. The Z-Transform of a unit impulse sequence δ[n] is:

7. The Z-Transform of a unit step sequence u[n] is:

8. A causal discrete-time LTI system has all its poles located:

9. The Discrete Fourier Transform (DFT) is used to analyze signals in the:

10. The Fast Fourier Transform (FFT) algorithm reduces the computational complexity of DFT from O(N²) to:

11. Which of the following describes an FIR (Finite Impulse Response) filter?

12. Which of the following describes an IIR (Infinite Impulse Response) filter?

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