Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q651: How many variables are used in the Karnaugh maps for D flip-flop inputs in the given table?
- A: 3
- B: 4
- C: 2
- D: 1
View Answer
B
Q652: Which equation represents the input D2 for a D flip-flop?
- A: D2 = Q2 ⊕ Q1Q0
- B: D2 = Q1 ⊕ Q0
- C: D2 = Q0
- D: D2 = Q2 ⊕ Q1
View Answer
A
Q653: What is the role of the state diagram in a 3-bit Up/Down counter?
- A: It shows how the counter increments or decrements based on input
- B: It lists the flip-flop inputs
- C: It provides timing diagrams for the circuit
- D: It simplifies Boolean expressions
View Answer
A
Q654: How does the 3-bit synchronous counter change its state when X=0 and X=1?
- A: X=0 counts up and X=1 counts down
- B: X=0 counts down and X=1 counts up
- C: Both X=0 and X=1 count up
- D: Both X=0 and X=1 count down
View Answer
A
Q655: What is shown in the next-state table for a 3-bit counter?
- A: The state transitions for both X=0 and X=1 inputs
- B: The Karnaugh map for flip-flop inputs
- C: The timing diagram for the counter
- D: The output of flip-flops
View Answer
A
Q656: Which flip-flop type is used to implement a counter with the given transition table?
- A: D flip-flop
- B: J-K flip-flop
- C: S-R flip-flop
- D: T flip-flop
View Answer
A
Q657: How are Karnaugh maps used to simplify flip-flop input expressions?
- A: By reducing the number of variables
- B: By directly mapping the input states
- C: By creating a transition table
- D: By simplifying the Boolean expressions
View Answer
D
Q658: What does the J-K flip-flop transition table illustrate?
- A: Input conditions and their effect on output transitions
- B: Simplified Karnaugh maps
- C: Next-state transitions
- D: State reduction techniques
View Answer
A
Q659: How are states 'f' and 'g' related in the context of state reduction?
- A: They are equivalent and can be replaced by one another
- B: They are complementary states
- C: They represent different outputs
- D: They have no relation
View Answer
A
Q660: What is the result of eliminating equivalent states from a state machine?
- A: Reduced number of unique states and potentially fewer flip-flops
- B: Increased complexity in the state diagram
- C: No change in the number of flip-flops
- D: More states in the state diagram
View Answer
A