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Multiplexers & Demultiplexers MCQs

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

Question 1
Digital ElectronicsMultiplexers & Demultiplexers

A multiplexer is commonly described as a?

  • AOne-to-many data distributor
  • BMany-to-one data selector
  • CBinary storage element
  • DFrequency divider only
Report an error
Correct Answer: B. Many-to-one data selector
Explanation: A multiplexer selects one of several input lines and connects it to a single output.
Reference: Multiplexer fundamentals
Question 2
Digital ElectronicsMultiplexers & Demultiplexers

A demultiplexer performs which basic function?

  • ARoutes one input to one of several outputs
  • BSelects many inputs simultaneously to one output
  • CStores one bit permanently
  • DAdds two binary numbers
Report an error
Correct Answer: A. Routes one input to one of several outputs
Explanation: A demultiplexer directs a single input signal to one selected output line.
Reference: Demultiplexer fundamentals
Question 6
Digital ElectronicsMultiplexers & Demultiplexers

An 8-to-1 multiplexer can directly implement a Boolean function of three variables by connecting the variables primarily to its?

  • AData outputs
  • BSelect inputs
  • CPower pins
  • DEnable output only
Report an error
Correct Answer: B. Select inputs
Explanation: Three variables provide 2^3 = 8 combinations, so they can drive the three select inputs while the data inputs are set according to the function truth table.
Reference: Standard digital electronics: implementing logic with multiplexers
Question 7
Digital ElectronicsMultiplexers & Demultiplexers

In a multiplexer tree, two stages of 4-to-1 multiplexers can be arranged to select among how many data inputs when the second stage selects among four first-stage outputs?

  • A4
  • B8
  • C16
  • D32
Report an error
Correct Answer: C. 16
Explanation: Four first-stage 4-to-1 multiplexers select from 16 total inputs, and a second-stage 4-to-1 multiplexer selects one of their four outputs.
Reference: Standard digital electronics: multiplexer expansion