Practice Code Converters And Multiplexers Multiple Choice Questions with Answers Quiz-1

Q.1.

A microcontroller differs from a microprocessor in that it has several ________ ports and ________ built into its architecture, making it better suited for ________ applications.

communication, PROMs, control
parallel, logic gates, processing
input/output, memory, control
data, memory, decoding

Q.2.

How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

A bubble indicates active-HIGH.
A bubble indicates active-LOW.
A square indicates active-HIGH.
A square indicates active-LOW.

Q.3.

How is an encoder different from a decoder?

The output of an encoder is a binary code for 1-of-N input.
The output of a decoder is a binary code for 1-of-N input.

Q.4.

If two inputs are active on a priority encoder, which will be coded on the output?

the higher value
the lower value
neither of the inputs
both of the inputs

Q.5.

Why is the Gray code more practical to use when coding the position of a rotating shaft?

All digits change between counts.
Two digits change between counts.
Only one digit changes between counts.

Q.6.

A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):

BCD matrix
display driver
encoder
decoder

Q.7.

For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs?

A₀ = 0	B₀ = 1	I_A < B = 0
A₁ = 1	B₁ = 0	I_A = B = 1
A₂ = 1	B₂ = 0	I_A > B = 0
A₃ = 0	B₃ = 0

A = B = 0, A < B = 0, A > B = 1
A = B = 0, A < B = 1, A > B = 0
A = B = 1, A < B = 0, A > B = 0
A = B = 0, A < B = 0, A > B = 0

Q.8.

How many 74184 BCD-to-binary converters would be required to convert two complete BCD digits to a binary number?

8
4
2
1

Q.9.

When two or more inputs are active simultaneously, the process is called:

first-in, first-out processing
priority encoding
ripple blanking
first-in, first-out processing or priority encoding

Q.10.

How many select lines would be required for an 8-line-to-1-line multiplexer?

2
3
4
8

Q.11.

A BCD decoder will have how many rows in its truth table?

10
9
8
3

Q.12.

What is the function of an enable input on a multiplexer chip?

to apply V_cc
to connect ground
to active the entire chip
to active one half of the chip

Q.13.

How many possible outputs would a decoder have with a 6-bit binary input?

16
32
64
128

Q.14.

One application of a digital multiplexer is to facilitate:

data generation
serial-to-parallel conversion
parity checking
data selector

Q.15.

The expansion inputs to a comparator are used for expansion to a(n):

4-bit system
8-bit system
BCD system
counter system

Q.16.

A principle regarding most IC decoders is that when the correct input is present, the related output will switch:

active-HIGH
to a high impedance
to an open
active-LOW

Q.17.

How many outputs are on a BCD decoder?

4
16
8
10

Q.18.

Most demultiplexers facilitate which type of conversion?

decimal-to-hexadecimal
single input, multiple outputs
ac to dc
odd parity to even parity

Q.19.

The primary use for Gray code is:

coded representation of a shaft's mechanical position
turning on/off software switches
to represent the correct ASCII code to indicate the angular position of a shaft on rotating machinery
to convert the angular position of a shaft on rotating machinery into hexadecimal code

Q.20.

Why is a demultiplexer called a data distributor?

The input will be distributed to one of the outputs.
One of the inputs will be selected for the output.
The output will be distributed to one of the inputs.

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