Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 37
Q741:
What is the Boolean expression that sets the SR1 latch in the elevator control system?
A. REQ1 + FLOOR1.DIR + OPEN.DIR
B. REQ2 + FLOOR2.DIR + OPEN.DIR
C. REQ1.DIR + OPEN.DIR
D. FLOOR1 + REQ1 + OPEN
Correct Answer:
A
Chapter: 37
Q742:
A 16-bit register can store a maximum of ________ bytes.
A. 1
B. 2
C. 4
D. 8
Correct Answer:
C
Chapter: 37
Q743:
What happens when the elevator is on the first floor, and the FLOOR1 button is pressed?
A. It discards the request
B. It moves to the second floor
C. It resets the system
D. It triggers the SR2 latch
Correct Answer:
A
Chapter: 37
Q744:
What does SR1=1 represent in the state table for REQ1, FLOOR1, and OPEN inputs?
A. W1 state
B. C1 state
C. UP state
D. DO state
Correct Answer:
B
Chapter: 37
Q745:
In the simplified state table, what state does the elevator move to from W2 when SR1=0?
A. C2
B. DO
C. W1
D. C1
Correct Answer:
A
Chapter: 37
Q746:
Which input causes the SR2 latch to set in the elevator control system?
A. FLOOR1
B. REQ1
C. OPEN.DIR
D. REQ2
Correct Answer:
D
Chapter: 37
Q747:
In the state table for SR2, what does SR2=0 in state C2 result in?
A. C1
B. UP
C. DO
D. W2
Correct Answer:
C
Chapter: 37
Q748:
How many states are defined in the elevator controller state diagram?
A. 4
B. 5
C. 6
D. 7
Correct Answer:
C
Chapter: 37
Q749:
What is the initial state defined for the elevator controller?
A. WAIT1
B. CLOSE1
C. UP
D. DOWN
Correct Answer:
A
Chapter: 37
Q750:
Which statement defines the transition from state UP in the elevator controller?
A. If (ARRIVE) then WAIT2 else UP
B. If (SR2) then UP else CLOSE1
C. If (SR1) then DOWN else CLOSE2
D. If (ARRIVE) then WAIT1 else DOWN
Correct Answer:
A
Chapter: 37
Q751:
What is the purpose of the CONSTATE.CLK = Clock statement in the ABEL file?
A. To synchronize state changes with the clock
B. To define the clock frequency
C. To reset the state machine
D. To initialize the circuit
Correct Answer:
A
Chapter: 37
Q752:
Which input signal resets the SR1 latch?
A. DOOR.FB & MOTION.FB
B. REQ1
C. FLOOR1
D. OPEN
Correct Answer:
A
Chapter: 37
Q753:
How is the direction of movement indicated in the elevator system?
A. MOTION
B. DIR
C. DOOR
D. SR2
Correct Answer:
B
Chapter: 37
Q754:
What is the function of the Traffic Signal Controller's LTIME signal?
A. It indicates 1 minute has elapsed
B. It indicates 5 minutes have elapsed
C. It resets the timer
D. It controls the yellow light
Correct Answer:
B
Chapter: 37
Q755:
What state does the Traffic Signal Controller transition to after NSG during the day?
A. NSY
B. EWG
C. EWR
D. NSY2
Correct Answer:
A
Chapter: 37
Q756:
Which state does the Traffic Signal Controller switch to from NSY2?
A. NSR
B. NSG
C. EWG
D. EWY
Correct Answer:
A
Chapter: 37
Q757:
How does the Traffic Signal Controller handle the transition from EWG during the night?
A. Switches to NSY
B. Remains in EWG if no car is detected
C. Moves directly to NSG
D. Switches to EWY
Correct Answer:
B
Chapter: 37
Q758:
What happens in the Traffic Signal Controller when a car arrives on both the NS and EW sections?
A. The state changes to NSY
B. The state remains NSG
C. The state changes to EWY
D. The state resets
Correct Answer:
A
Chapter: 37
Q759:
What input to the Traffic Signal Controller determines the state transition at night?
A. LTIME
B. NSSR
C. STIME
D. EWSR
Correct Answer:
C
Chapter: 37
Q760:
What is the output of the Traffic Signal Controller in the state EWR?
A. North-South Green
B. East-West Green
C. North-South Red
D. East-West Red
Correct Answer:
D