Demultiplexers (Data Distributors) – 2 MCQ’s

Digital Circuits Electronics & Communication Engineering

This set of Digital Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Demultiplexers (Data Distributors) – 2″.

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

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

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

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

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

6. 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 gives single output

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

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

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