ETC EngineeringMCQs
Home

Digital Receivers MCQs

Practice Digital Receivers MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Communication SystemsDigital Receivers

The main purpose of a matched filter in a digital receiver is to?

  • AMaximize output SNR at a specified sampling instant for a known signal in AWGN
  • BEliminate the need for synchronization
  • CMake all symbol waveforms identical
  • DGenerate carrier power
Report an error
Correct Answer: A. Maximize output SNR at a specified sampling instant for a known signal in AWGN
Explanation: For a known signal in additive white Gaussian noise, the matched filter maximizes the signal-to-noise ratio at the decision sampling instant.
Reference: Standard communication systems: digital receivers
Question 2
Communication SystemsDigital Receivers

Intersymbol interference (ISI) occurs when?

  • AOne transmitted symbol interferes with neighboring symbols
  • BNoise power becomes exactly zero
  • COnly one symbol is transmitted
  • DCarrier frequency equals zero
Report an error
Correct Answer: A. One transmitted symbol interferes with neighboring symbols
Explanation: Channel dispersion or bandwidth limitations can spread pulses so that adjacent symbol intervals overlap, causing ISI.
Reference: Standard communication systems: digital receivers
Question 3
Communication SystemsDigital Receivers

The Nyquist zero-ISI criterion is concerned primarily with?

  • APulse shaping to avoid interference at symbol sampling instants
  • BIncreasing thermal noise
  • CGenerating AM sidebands
  • DReducing antenna length
Report an error
Correct Answer: A. Pulse shaping to avoid interference at symbol sampling instants
Explanation: Nyquist pulse-shaping conditions allow neighboring pulses to have zero contribution at the desired sampling instants, ideally eliminating ISI.
Reference: Standard communication systems: digital receivers