Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q441: How many outputs does a 74X153 8-input multiplexer have?
- A: 1
- B: 2
- C: 4
- D: 8
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A
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
View Answer
A