MCQ on Digital Electronics with Answers - 1
Multiple Choice Questions with Answers on Digital Electronics Circuits - Multiplexer, Demultiplexer, Encoder, Decoder
1. The word demultiplex
means ___________
a. One into many
b. Many into one
c. Distributor
d. One into many as well as Distributor
Answer:
d
2. 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
Answer:
a
3. 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
Answer:
b
4. In a multiplexer the
output depends on its ___________
a. Data inputs
b. Select inputs
c. Select outputs
d. Enable pin
Answer:
b
5. How many AND gates
are required for a 1-to-8 multiplexer?
a. 2
b. 6
c. 8
d. 5
Answer:
c
6. Which IC is used for
the implementation of 1-to-16 DEMUX?
a. IC 74154
b. IC 74155
c. IC 74139
d. IC 74138
Answer:
a
7. How many control lines are there in 128 X 1
multiplexer?
a.
8
b.
6
c. 7
d. 5
Answer:
c
8. Which of the following is not valid encoder?
a.
8
X 3
b.
5
X 32
c.
2
X 1
d.
All
are valid
Answer:
b
9. A multiplexer is also known as
a.
a
data accumulator
b.
a
data restorer
c.
a
data selector
d.
a
data distributor
Answer:
c
10. In boolean algebra,
the OR operation is performed by which properties?
a. Associative properties
b. Commutative properties
c. Distributive properties
d. All of the Mentioned
Answer:
d
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