Q13: Multiplexers#

Time Estimate15-30 minutes   Grade Impact0.5%   DueSep 21 @ 12pm  

Objective
Reinforce an understanding of NAND and NOR universal logic gates.

Free Response Questions#

1. What is the role of the select lines in a multiplexer?

2. Why might an engineer choose to use a multiplexer in a circuit design?

Multiple Choice Questions#

3. How many data inputs does a multiplexer have if it has 3 select lines?

   • 3
   • 4
   • 8
   • 16

4. What is known about the inputs of a 4-to-1 multiplexer whose output is 1 and whose select lines are set to 11?

   • The input indexed by 11 is 1, and the other inputs are 0.
   • The input indexed by 11 is 0, and the other inputs are 1.
   • The input indexed by 11 is 1, and the other inputs don’t matter.
   • The inputs sum to 11.

5. Which of the following statements about multiplexers is true?

   • A multiplexer can only have one input.
   • A multiplexer can have multiple outputs.
   • A multiplexer selects one of many inputs to forward to a single output.
   • A multiplexer requires a register to function.