Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q771: Which state causes the Timer to reset in the Traffic Light Controller?
- A: NSY2 or EWY2
- B: NSGRN or EWGRN
- C: NSRED or EWRED
- D: NSYEL or EWYEL
View Answer
A
Q772: What does the MANUAL input do in the Traffic Light Controller?
- A: Resets the Timer
- B: Activates Manual Mode
- C: Sets Green lights
- D: Changes flash rate
View Answer
B
Q773: What signal determines the flash rate in Manual Mode?
- A: TRSTATE
- B: MANUAL
- C: CLK
- D: FLASHCLK
View Answer
D
Q774: Which of the following outputs represent the traffic signal lamps connected to the Traffic Controller?
- A: NSRED, NSYEL, NSGRN
- B: TRSTATE, CLK, TIMER
- C: LTIME, STIME, CLK
- D: Q0, Q1, Q2
View Answer
A
Q775: In the Traffic Light Controller, what happens when the TRSTATE is NSG?
- A: NSRED is on
- B: NSYEL is on
- C: NSGRN is on
- D: EWRED is on
View Answer
C
Q776: Which input signal puts the traffic light in Manual Mode?
- A: FLASHCLK
- B: MANUAL
- C: Q0
- D: TIMER
View Answer
B
Q777: What determines the next state in a clocked synchronous state machine?
- A: Present state and output
- B: Output only
- C: Current state and input
- D: Clock signal
View Answer
C
Q778: What is the characteristic equation for a D flip-flop?
- A: Qt+1=DQ_{t+1} = DQt+1=D
- B: Qt+1=S+RQtQ_{t+1} = S + RQtQt+1=S+RQt
- C: Qt+1=JQ+KQ′Q_{t+1} = JQ + KQ'Qt+1=JQ+KQ′
- D: Qt+1=TQ+Q′Q_{t+1} = TQ + Q'Qt+1=TQ+Q′
View Answer
A
Q779: How many states can be represented with two state variables (Q0 and Q1) in a state machine?
- A: 2
- B: 3
- C: 4
- D: 5
View Answer
C
Q780: Which state machine output depends on both the current state and the input?
- A: Moore machine
- B: Mealy machine
- C: Turing machine
- D: Asynchronous machine
View Answer
B