Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 37
Q761:
What type of logic is used to reset the TMRST signal in the Traffic Signal Controller?
A. Combinational
B. Sequential
C. Synchronous
D. Asynchronous
Correct Answer:
A
Chapter: 37
Q762:
In the Traffic Signal Controller, which pin is used for the NSSR input?
A. Pin 1
B. Pin 2
C. Pin 14
D. Pin 17
Correct Answer:
B
Chapter: 37
Q763:
Which state in the Traffic Signal Controller has both North-South and East-West lights red?
A. NSY
B. EWG
C. EWR
D. NSR
Correct Answer:
C
Chapter: 37
Q764:
What does the EWY2 state indicate in the Traffic Signal Controller?
A. North-South Green
B. East-West Green
C. East-West Yellow transition
D. North-South Yellow transition
Correct Answer:
C
Chapter: 37
Q765:
How many output signals control the traffic lights in the Traffic Signal Controller?
A. 4
B. 5
C. 6
D. 7
Correct Answer:
D
Chapter: 37
Q766:
What happens when the EWSR & !NSSR condition is true in the NSG state of the Traffic Signal Controller?
A. The state changes to NSY
B. The state remains in NSG
C. The state moves to EWY
D. The state changes to NSR
Correct Answer:
B
Chapter: 37
Q767:
What is the role of the TMRST signal in the Traffic Signal Controller?
A. To switch the state
B. To reset the timer
C. To control the green light
D. To activate the LTIME signal
Correct Answer:
B
Chapter: 37
Q768:
Which input in the Traffic Signal Controller determines if the traffic lights should change after 5 minutes?
A. STIME
B. EWSR
C. LTIME
D. NSSR
Correct Answer:
C
Chapter: 37
Q769:
How is the floor number displayed in the elevator system?
A. Using SR1
B. Using SR2
C. Through the MOTION and DIR inputs
D. Through the FLOOR1 and FLOOR2 inputs
Correct Answer:
C
Chapter: 38
Q770:
What does the TRSTATE variable in the Traffic Light Controller depend on?
A. State inputs
B. Timer signals
C. Clock transition
D. Manual input
Correct Answer:
C
Chapter: 38
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
Correct Answer:
A
Chapter: 38
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
Correct Answer:
B
Chapter: 38
Q773:
What signal determines the flash rate in Manual Mode?
A. TRSTATE
B. MANUAL
C. CLK
D. FLASHCLK
Correct Answer:
D
Chapter: 38
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
Correct Answer:
A
Chapter: 38
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
Correct Answer:
C
Chapter: 38
Q776:
Which input signal puts the traffic light in Manual Mode?
A. FLASHCLK
B. MANUAL
C. Q0
D. TIMER
Correct Answer:
B
Chapter: 38
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
Correct Answer:
C
Chapter: 38
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′
Correct Answer:
A
Chapter: 38
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
Correct Answer:
C
Chapter: 38
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
Correct Answer:
B