# Demultiplexers (Data Distributors) – 1 MCQ’s

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Demultiplexers (Data Distributors) – 1″.

1. Most demultiplexers facilitate which type of conversion?
b) Single input, multiple outputs
c) AC to DC
d) Odd parity to even parity

2. In 1-to-4 multiplexer, if C1 = 0 & C2 = 1, then the output will be ___________
a) Y0
b) Y1
c) Y2
d) Y3

3. How many AND gates are required for a 1-to-8 multiplexer?
a) 2
b) 6
c) 8
d) 5

4. Which IC is used for the implementation of 1-to-16 DEMUX?
a) IC 74154
b) IC 74155
c) IC 74139
d) IC 74138

5. The word demultiplex means ___________
a) One into many
b) Many into one
c) Distributor
d) One into many as well as Distributor

6. The output Q4 of this 1-to-8 demultiplexer is ____________

a) Q2.(Q1)’.Q0.I
b) Q2.Q1.(Q0)’.I
c) Q2.(Q1)’.(Q0)’.I
d) Q2.(Q1).Q0.I

7. In 1-to-4 demultiplexer, how many select lines are required?
a) 2
b) 3
c) 4
d) 5

8. How many select lines are required for a 1-to-8 demultiplexer?
a) 2
b) 3
c) 4
d) 5

9. In a multiplexer the output depends on its ___________
a) Data inputs
b) Select inputs
c) Select outputs
d) Enable pin

10. Why is a demultiplexer called a data distributor?
a) The input will be distributed to one of the outputs
b) One of the inputs will be selected for the output
c) The output will be distributed to one of the inputs
d) Single input to Single Output

11. In 1-to-4 multiplexer, if C1 = 1 & C2 = 1, then the output will be ___________
a) Y0
b) Y1
c) Y2
d) Y3