Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q431: In an 8-to-3 Binary Encoder, what output is produced when input I4 is active?
- A: zero
- B: 1
- C: 10
- D: 100
View Answer
C
Q432: How does a Priority Encoder differ from a Binary Encoder?
- A: It handles multiple active inputs by prioritizing
- B: It produces a binary output
- C: It has fewer inputs than a Binary Encoder
- D: It has higher propagation delay
View Answer
A
Q433: What is the function of the Enable Output (EO) in a priority encoder?
- A: To cascade multiple encoders
- B: To activate the highest priority input
- C: To reset the encoder
- D: To disable the outputs
View Answer
A
Q434: What is the output of a Decimal-to-BCD Encoder when decimal 5 is input?
- A: zero
- B: 101
- C: 1010
- D: 1111
View Answer
B
Q435: In a 4-to-1 Multiplexer, what happens when S1 = 1 and S0 = 0?
- A: Input I0 is selected
- B: Input I1 is selected
- C: Input I2 is selected
- D: Input I3 is selected
View Answer
C
Q436: What is the primary use of a multiplexer in a computer system?
- A: To route data from multiple sources to a single destination
- B: To convert binary data to decimal
- C: To perform arithmetic operations
- D: To store data
View Answer
A
Q437: What is the primary function of the 74X157 2-input, 4-bit multiplexer?
- A: Route 4-bit data from one source to another
- B: Route 2-bit data from multiple sources
- C: Route 8-bit data from one source to another
- D: Route 4-bit data from multiple sources
View Answer
A
Q438: How many sets of 4-bit inputs does the 74X157 multiplexer have?
- A: 1
- B: 2
- C: 3
- D: 4
View Answer
B
Q439: What happens when the select input (S) of the 74X157 multiplexer is set to 0?
- A: The first set of 4-bit inputs is connected to the output
- B: The second set of 4-bit inputs is connected to the output
- C: The output is disabled
- D: The output is connected to ground
View Answer
A
Q440: In the 74X157 multiplexer, what does the active-low G input control?
- A: Enables or disables the multiplexer
- B: Selects between the two sets of 4-bit inputs
- C: Connects the output to ground
- D: Sets the select input to high
View Answer
A