Signal Processing MCQs

1. What is signal processing?

  • A) The conversion of digital signals to analog
  • B) Analysis, modification, and synthesis of signals
  • C) Transmitting signals over long distances
  • D) Storing signals in databases

Answer: B) Analysis, modification, and synthesis of signals


2. Which of the following is an example of a continuous-time signal?

  • A) A digital clock display
  • B) A temperature sensor’s analog output
  • C) Binary data transmission
  • D) Text messaging

Answer: B) A temperature sensor’s analog output


3. What does FFT stand for in signal processing?

  • A) Fast Frequency Transform
  • B) Frequency Function Table
  • C) Fast Fourier Transform
  • D) Fourier Frequency Transfer

Answer: C) Fast Fourier Transform


4. Which process converts a continuous-time signal into a discrete-time signal?

  • A) Quantization
  • B) Modulation
  • C) Sampling
  • D) Filtering

Answer: C) Sampling


5. In digital signal processing (DSP), what is the purpose of quantization?

  • A) Increasing the signal frequency
  • B) Representing continuous amplitudes with discrete levels
  • C) Filtering out unwanted frequencies
  • D) Reducing noise in the signal

Answer: B) Representing continuous amplitudes with discrete levels


6. What is the Nyquist theorem used for in signal processing?

  • A) To determine the maximum bandwidth
  • B) To ensure no information is lost during sampling
  • C) To improve signal-to-noise ratio
  • D) To measure signal power

Answer: B) To ensure no information is lost during sampling


7. What is the result of undersampling a signal?

  • A) Better noise immunity
  • B) Aliasing
  • C) Higher frequency resolution
  • D) Reduced bandwidth

Answer: B) Aliasing


8. What is a low-pass filter used for?

  • A) To pass low frequencies and block high frequencies
  • B) To amplify high frequencies
  • C) To block low frequencies and pass high frequencies
  • D) To remove noise from signals

Answer: A) To pass low frequencies and block high frequencies


9. Which domain does the Fourier Transform operate in?

  • A) Spatial domain
  • B) Time domain
  • C) Frequency domain
  • D) Amplitude domain

Answer: C) Frequency domain


10. What is the main purpose of a Digital Signal Processor (DSP)?

  • A) To amplify analog signals
  • B) To process and manipulate digital signals in real-time
  • C) To store large datasets
  • D) To perform encryption

Answer: B) To process and manipulate digital signals in real-time


11. Which component is essential for converting analog signals into digital form?

  • A) Digital-to-Analog Converter (DAC)
  • B) Analog-to-Digital Converter (ADC)
  • C) Modulator
  • D) Filter

Answer: B) Analog-to-Digital Converter (ADC)


12. What is the primary advantage of digital signal processing over analog signal processing?

  • A) Simplicity of implementation
  • B) Ability to work with continuous signals
  • C) Higher precision and flexibility
  • D) Reduced power consumption

Answer: C) Higher precision and flexibility


13. What is the Z-transform used for in DSP?

  • A) Analyzing systems in the time domain
  • B) Solving differential equations
  • C) Analyzing discrete-time signals and systems
  • D) Converting analog signals to digital

Answer: C) Analyzing discrete-time signals and systems


14. What is convolution in signal processing?

  • A) The product of two signals
  • B) Integration of one signal with the reverse of another
  • C) Filtering of high frequencies
  • D) Summation of two discrete signals

Answer: B) Integration of one signal with the reverse of another


15. Which of the following is an application of signal processing?

  • A) Audio compression
  • B) Image enhancement
  • C) Data communication
  • D) All of the above

Answer: D) All of the above