ETC EngineeringMCQs
Home

Error Control MCQs

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

Question 1
Communication SystemsError Control

Interleaving in a digital communication system is especially useful for combating?

  • ABurst errors
  • BCarrier generation
  • CQuantization itself
  • DAntenna polarization mismatch only
Report an error
Correct Answer: A. Burst errors
Explanation: Interleaving spreads adjacent corrupted bits or symbols across different codewords so a burst can appear as more manageable separated errors to the decoder.
Reference: Standard communication systems: interleaving
Question 2
Communication SystemsError Control

A burst-error channel corrupts 12 consecutive coded bits. An idealized block interleaver primarily helps by?

  • ASpreading those errors across separated decoder positions
  • BIncreasing the RF carrier power automatically
  • CChanging every 0 into 1
  • DRemoving the need for channel coding
Report an error
Correct Answer: A. Spreading those errors across separated decoder positions
Explanation: The interleaver rearranges transmission order, so consecutive channel errors are dispersed after deinterleaving.
Reference: Standard communication systems: burst-error interleaving
Question 3
Communication SystemsError Control

Automatic repeat request (ARQ) primarily combines error detection with?

  • ARetransmission requests
  • BAnalog frequency modulation
  • CSource entropy maximization
  • DCarrier suppression
Report an error
Correct Answer: A. Retransmission requests
Explanation: ARQ detects erroneous or missing blocks and requests retransmission rather than relying solely on forward correction.
Reference: Standard communication systems: ARQ
Question 4
Communication SystemsError Control

Forward error correction (FEC) differs from basic ARQ because FEC aims to?

  • ACorrect errors at the receiver without requiring retransmission for each correctable error
  • BEliminate all redundancy
  • COperate only on analog AM signals
  • DMake channel noise exactly zero
Report an error
Correct Answer: A. Correct errors at the receiver without requiring retransmission for each correctable error
Explanation: FEC adds sufficient coding redundancy for the receiver to correct specified error patterns without requesting retransmission.
Reference: Standard communication systems: forward error correction