Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 18
Q441:
How many outputs does a 74X153 8-input multiplexer have?
A. 1
B. 2
C. 4
D. 8
Correct Answer:
A
Chapter: 18
Q442:
What is the function of the active-low enable input (C) in the 8-input multiplexer configuration?
A. To select between the first and second 4-input multiplexers
B. To enable the 8-input multiplexer
C. To disable the 8-input multiplexer
D. To connect the outputs of the multiplexers through an OR gate
Correct Answer:
A
Chapter: 18
Q443:
What happens when the enable input (C) is set to 0 in the 8-input multiplexer?
A. The first 4-input multiplexer is selected
B. The second 4-input multiplexer is selected
C. The multiplexer outputs are disabled
D. The output is connected to a NOT gate
Correct Answer:
A
Chapter: 18
Q444:
In a 16-input multiplexer using two 74XX153 multiplexers, what controls the selection of the multiplexers?
A. A 2-to-4 decoder
B. A 3-to-8 decoder
C. A 4-to-16 decoder
D. A 2-to-8 decoder
Correct Answer:
A
Chapter: 18
Q445:
How is the output selected in a 16-input multiplexer setup?
A. By connecting the outputs of the multiplexers through a 4-input OR gate
B. By using a single 8-input multiplexer
C. By enabling each multiplexer individually
D. By using a 4-to-1 multiplexer
Correct Answer:
A
Chapter: 18
Q446:
In the 2-input, 8-bit multiplexer circuit, what happens when the G input is set to 1?
A. Both multiplexers are disabled
B. Both multiplexers are enabled
C. Only one multiplexer is enabled
D. The output is disconnected
Correct Answer:
A
Chapter: 18
Q447:
What type of display is used in a 2-digit decimal display circuit shown in the content?
A. Common Anode 7-Segment Display and Common Cathode 7-Segment Display
B. Only Common Anode 7-Segment Display
C. Only Common Cathode 7-Segment Display
D. Both Common Anode and Common Cathode LED displays
Correct Answer:
A
Chapter: 18
Q448:
What is the difference between a Common Anode and Common Cathode 7-Segment Display?
A. Common Anode has positive ends connected together; Common Cathode has negative ends connected together
B. Common Cathode has positive ends connected together; Common Anode has negative ends connected together
C. Both have positive ends connected together
D. Both have negative ends connected together
Correct Answer:
A
Chapter: 18
Q449:
How does the 8-to-1 multiplexer handle parallel to serial conversion?
A. By using a 3-bit counter to select the inputs sequentially
B. By using a 2-to-4 decoder
C. By using a single 8-bit counter
D. By connecting all inputs to the output simultaneously
Correct Answer:
A
Chapter: 18
Q450:
What role does the 3-bit counter play in the parallel to serial conversion circuit?
A. It selects the inputs of the multiplexer sequentially
B. It counts the number of bits to be transmitted
C. It controls the enable input of the multiplexer
D. It connects the output to multiple wires
Correct Answer:
A
Chapter: 18
Q451:
In a logic function generator using a multiplexer, what do the select inputs represent?
A. The function variables
B. The function output
C. The logic gates used in the function
D. The number of inputs required for the function
Correct Answer:
A
Chapter: 18
Q452:
How is operation sequencing achieved in a manufacturing process controlled by a multiplexer?
A. By using a counter to step through different processes
B. By enabling all processes simultaneously
C. By using a 2-input multiplexer to switch between different operations
D. By connecting multiple decoders in parallel
Correct Answer:
A
Chapter: 19
Q453:
What is the primary function of a Demultiplexer?
A. To route data from multiple inputs to a single output
B. To route data from a single input to multiple outputs
C. To combine multiple outputs into a single input
D. To perform arithmetic operations on inputs
Correct Answer:
B
Chapter: 19
Q454:
What is the difference between a 1-to-4 Demultiplexer and a 2-to-4 Decoder?
A. The Demultiplexer has a single input and multiple outputs
B. The Decoder has a single input and multiple outputs
C. The Demultiplexer has multiple inputs and a single output
D. The Decoder has multiple inputs and a single output
Correct Answer:
A
Chapter: 19
Q455:
In a 1-to-4 Demultiplexer, what does the Data Input line do?
A. It enables the selection of outputs
B. It routes data from the outputs to the input
C. It functions as the address input for the demultiplexer
D. It controls the power supply of the Demultiplexer
Correct Answer:
A
Chapter: 19
Q456:
What is a common application of a Demultiplexer in computing?
A. Connecting a single source to multiple destinations
B. Adding two numbers together
C. Multiplying two numbers
D. Converting parallel data to serial data
Correct Answer:
A
Chapter: 19
Q457:
How does a Demultiplexer reconstruct parallel data from a serial data stream?
A. By using a counter to route data to successive outputs
B. By combining all serial data into one output
C. By converting serial data to a single parallel output
D. By storing data in a single register
Correct Answer:
A
Chapter: 19
Q458:
What does a Programmable Logic Device (PLD) replace in digital circuits?
A. Logic gates and MSI chips
B. Memory chips
C. Microprocessors
D. Analog components
Correct Answer:
A
Chapter: 19
Q459:
Which arrays in a Programmable Logic Device (PLD) can be programmed?
A. AND and OR arrays
B. Only AND arrays
C. Only OR arrays
D. Flip-flops
Correct Answer:
A
Chapter: 19
Q460:
What is the main feature of a Programmable Read-Only Memory (PROM)?
A. A fixed AND array and a programmable OR array
B. A programmable AND array and a fixed OR array
C. An entirely programmable array
D. A fixed OR array and a programmable AND array
Correct Answer:
A