Digital Signal Processing (DSP) – MCQs

1. : What does DSP stand for in electronics?
(A) Digital Signal Processor
(B) Digital System Processing
(C) Data Signal Processing
(D) Digital Storage Processing

2. : The Z-transform is used in DSP to analyze:
(A) Continuous-time systems
(B) Discrete-time systems
(C) Analog filters
(D) Noise signals

3. : The Discrete Fourier Transform (DFT) is used to:
(A) Filter signals
(B) Solve equations
(C) Convert time domain to frequency domain
(D) Amplify signals

4. : What is the major advantage of FFT over DFT?
(A) Better accuracy
(B) Faster computation
(C) Higher sampling rate
(D) Less power

5. : A signal is said to be discrete when it is:
(A) Analog
(B) Continuous
(C) Sampled and quantized
(D) Periodic

6. : What is the Nyquist rate?
(A) Twice the maximum frequency of the signal
(B) Half the sampling frequency
(C) Maximum allowable frequency
(D) Cut-off frequency

7. : Which of the following is a window function in DSP?
(A) Gaussian
(B) Hamming
(C) Fourier
(D) Nyquist

8. : In DSP, aliasing occurs due to:
(A) Over-sampling
(B) Under-sampling
(C) Filtering
(D) Noise

9. : FIR stands for:
(A) Frequency Impulse Response
(B) Finite Impulse Response
(C) Fast Impulse Response
(D) Filtered Impulse Response

10. : IIR stands for:
(A) Infinite Impulse Response
(B) Initial Impulse Response
(C) Inverse Impulse Response
(D) Iterative Impulse Response

11. : Which transform is commonly used for spectral analysis in DSP?
(A) Laplace Transform
(B) Z-Transform
(C) Fourier Transform
(D) Bode Plot

12. : In DSP, convolution is used to:
(A) Integrate signals
(B) Add noise
(C) Combine two signals
(D) Multiply in time domain

13. : The main use of DSP in audio processing is to:
(A) Compress the data
(B) Modulate the frequency
(C) Enhance sound quality
(D) Change analog to digital

14. : A system is linear if it follows:
(A) Time invariance
(B) Superposition principle
(C) Stability
(D) Frequency shift

15. : The output of a linear time-invariant system is found using:
(A) Fourier transform
(B) Laplace transform
(C) Convolution
(D) Sampling

16. : Which one is a characteristic of an FIR filter?
(A) Always stable
(B) May become unstable
(C) Recursive
(D) Infinite memory

17. : Which of the following causes leakage in DFT?
(A) High sampling rate
(B) Inadequate windowing
(C) Low resolution
(D) Noise

18. : Digital filters are better than analog filters because they:
(A) Are less flexible
(B) Cannot be changed once built
(C) Are programmable and stable
(D) Have low performance

19. : Quantization error is caused by:
(A) Aliasing
(B) Sampling
(C) Truncating signal values
(D) High frequency noise

20. : A circular convolution is used primarily in:
(A) FIR filters
(B) IIR filters
(C) DFT
(D) Analog filters

21. : The main function of an ADC in DSP is to:
(A) Filter signals
(B) Store data
(C) Convert analog to digital
(D) Amplify signals

22. : What is the unit of digital frequency?
(A) Hertz
(B) Radians/sample
(C) Seconds
(D) Amplitude

23. : Which operation is equivalent to multiplication in the frequency domain?
(A) Sampling
(B) Convolution in time domain
(C) Shifting
(D) Filtering

24. : What is the advantage of windowing a signal before DFT?
(A) Increase noise
(B) Reduce spectral leakage
(C) Increase speed
(D) Increase amplitude

25. : In a real-time DSP system, latency is defined as:
(A) Memory requirement
(B) Computation time delay
(C) Output voltage
(D) Noise level