# Q1: A principle regarding most IC decoders is that when the correct input is present, the related output will switch:

A
active-HIGH
B
to a high impedance
C
to an open
D
active-LOW

# Q2: What control signals may be necessary to operate a 1-line-to-16 line decoder?

A
flasher circuit control signal
B
a LOW on all gate enable inputs
C
D
a HIGH on all gate enable circuits

A
16
B
32
C
64
D
128

# Q4: The primary use for Gray code is:

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

# Q5: A binary code that progresses such that only one bit changes between two successive codes is:

A
nine's-complement code
B
8421 code
C
excess-3 code
D
Gray code

# Q6: How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

A
A bubble indicates active-HIGH.
B
A bubble indicates active-LOW.
C
A square indicates active-HIGH.
D
A square indicates active-LOW.

# Q7: The inputs/outputs of an analog multiplexer/demultiplexer are:

A
bidirectional
B
unidirectional
C
even parity
D
binary-coded decimal

# Q8: Use the weighting factors to convert the following BCD numbers to binary. 0101 0011        0010 0110 1000

A
01010011    001001101000
B
11010100    100001100000
C
110101        100001100
D
101011        001100001

A
4
B
6
C
8
D
10

A
2
B
3
C
4
D
8

A
8
B
4
C
2
D
1

# Q12: One application of a digital multiplexer is to facilitate:

A
data generation
B
serial-to-parallel conversion
C
parity checking
D
data selector

A
BCD matrix
B
display driver
C
encoder
D
decoder

# Q14: How is an encoder different from a decoder?

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

# Q15: Why is the Gray code more practical to use when coding the position of a rotating shaft?

A
All digits change between counts.
B
Two digits change between counts.
C
Only one digit changes between counts.

A
4-bit system
B
8-bit system
C
BCD system
D
counter system

A
10
B
9
C
8
D
3

# Q18: For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs? A0 = 0B0 = 1IA < B = 0 A1 = 1B1 = 0IA = B = 1 A2 = 1B2 = 0IA > B = 0 A3 = 0B3 = 0

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

# Q19: If two inputs are active on a priority encoder, which will be coded on the output?

A
the higher value
B
the lower value
C
neither of the inputs
D
both of the inputs

# Q20: Most demultiplexers facilitate which type of conversion?

A
B
single input, multiple outputs
C
ac to dc
D
odd parity to even parity

A
2
B
4
C
8
D
18

# Q22: What is the function of an enable input on a multiplexer chip?

A
to apply Vcc
B
to connect ground
C
to active the entire chip
D
to active one half of the chip

A
4
B
8
C
10
D
16

# Q24: In a BCD-to-seven-segment converter, why must a code converter be utilized?

A
to convert the 4-bit BCD into 7-bit code
B
to convert the 4-bit BCD into 10-bit code
C
to convert the 4-bit BCD into Gray code
D
No conversion is necessary.

A
4
B
16
C
8
D
10

# Q26: Why can a CMOS IC be used as both a multiplexer and a demultiplexer?

A
It cannot be used as both.
B
CMOS uses bidirectional switches.

# Q27: A truth table with output columns numbered 0–15 may be for which type of decoder IC?

A
B
dual octal outputs
C
D

# Q28: One way to convert BCD to binary using the hardware approach is:

A
with MSI IC circuits
B
with a keyboard encoder
C
with an ALU
D
UART

A
4
B
8
C
10
D
1

A
encoder
B
display
C
counter
D
decoder

# Q31: A basic multiplexer principle can be demonstrated through the use of a:

A
single-pole relay
B
DPDT switch
C
rotary switch
D
linear stepper

# Q32: How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

A
A bubble indicates active-HIGH.
B
A bubble indicates active-LOW.
C
A square indicates active-HIGH.
D
A square indicates active-LOW.

# Q33: A microcontroller differs from a microprocessor in that it has several ________ ports and ________ built into its architecture, making it better suited for ________ applications.

A
communication, PROMs, control
B
parallel, logic gates, processing
C
input/output, memory, control
D
data, memory, decoding

# Q34: What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?

A
S0 = 0, S1 = 1, S2 = 0
B
S0 = 0, S1 = 0, S2 = 1
C
S0 = 1, S1 = 1, S2 = 0
D
S0 = 1, S1 = 0, S2 = 1

# Q35: From the following list of input conditions, determine the state of the five output leads on a 74148 octal-to-binary encoder. I0 = 1 I3 = 1 I6 = 1 I1 = 1 I4 = 0 I7 = 1 I2 = 1 I5 = 1 EI = 0

A
GS = L, A0 = L, A1 = L, A2 = H, EO = H
B
GS = L, A0 = H, A1 = L, A2 = L, EO = H
C
GS = L, A0 = L, A1 = H, A2 = L, EO = H
D
GS = L, A0 = H, A1 = H, A2 = L, EO = H

# Q36: Which of the following is not a weighted value positional numbering system:

A
B
binary-coded decimal
C
binary
D
octal

# Q37: When two or more inputs are active simultaneously, the process is called:

A
first-in, first-out processing
B
priority encoding
C
ripple blanking
D
first-in, first-out processing or priority encoding

# Q38: What do the mathematical symbols A < b and A > B mean?

A
A < B means A is greater than B. A > B means A is less than B.
B
A > B means A is less than B. A < B means A is greater than B.
C
A < B means A is less than B. A > B means A is greater than B.

A
True
B
False

# Q40: 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.

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