Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 31
Q641:
Which flip-flop type is used in the provided 3-bit up-counter example?
A. J-K flip-flop
B. D flip-flop
C. S-R flip-flop
D. T flip-flop
Correct Answer:
A
Chapter: 31
Q642:
What is the result of setting J=0 in a J-K flip-flop transition table?
A. The next state output remains 0
B. The next state output is set to 1
C. The flip-flop toggles between 0 and 1
D. The flip-flop is set to 1
Correct Answer:
A
Chapter: 31
Q643:
How is the frequency of an unknown signal determined using a frequency counter?
A. By counting the number of input signal pulses
B. By measuring the voltage of the input signal
C. By comparing with a known frequency
D. By calculating the time interval and pulse count
Correct Answer:
A
Chapter: 31
Q644:
What is the function of the 3-input AND gate in a frequency counter circuit?
A. To enable the counter during the sampling interval
B. To reset the counter before counting
C. To display the counter output
D. To adjust the sampling interval
Correct Answer:
A
Chapter: 31
Q645:
What does the Karnaugh map for J2 and K2 inputs show?
A. Simplified logic expressions for flip-flop inputs
B. The timing sequence for the frequency counter
C. The transition table for S-R flip-flops
D. The states of the frequency counter
Correct Answer:
A
Chapter: 31
Q646:
What is a key feature of the S-R flip-flop transition table?
A. It cannot have both S and R inputs set to 1 simultaneously
B. It provides timing diagrams
C. It simplifies Karnaugh maps
D. It lists next-state transitions for counters
Correct Answer:
A
Chapter: 31
Q647:
What does the S-R flip-flop transition table use for its inputs?
A. Valid S and R input combinations
B. J and K input states
C. Timing diagram information
D. Frequency counter settings
Correct Answer:
A
Chapter: 32
Q648:
What does the D flip-flop transition table indicate?
A. It lists the flip-flop inputs and their output transitions
B. It describes the timing of flip-flops
C. It shows the Karnaugh map for flip-flops
D. It details the J-K flip-flop operation
Correct Answer:
A
Chapter: 32
Q649:
How does the D flip-flop follow the input according to its transition table?
A. The output directly matches the input
B. The output is inverted relative to the input
C. The output is always high
D. The output is always low
Correct Answer:
A
Chapter: 32
Q650:
What information is given by the Karnaugh maps for D flip-flop inputs?
A. Simplified Boolean expressions for the inputs
B. Transition times for each state
C. State changes for J-K flip-flops
D. The next-state transitions of the flip-flops
Correct Answer:
A
Chapter: 32
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
Correct Answer:
B
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
D
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A
Chapter: 32
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
Correct Answer:
A