Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
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
View Answer
A
Q742: A 16-bit register can store a maximum of ________ bytes.
- A: 1
- B: 2
- C: 4
- D: 8
View Answer
C
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
View Answer
A
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
View Answer
B
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
View Answer
A
Q746: Which input causes the SR2 latch to set in the elevator control system?
- A: FLOOR1
- B: REQ1
- C: OPEN.DIR
- D: REQ2
View Answer
D
Q747: In the state table for SR2, what does SR2=0 in state C2 result in?
- A: C1
- B: UP
- C: DO
- D: W2
View Answer
C
Q748: How many states are defined in the elevator controller state diagram?
- A: 4
- B: 5
- C: 6
- D: 7
View Answer
C
Q749: What is the initial state defined for the elevator controller?
- A: WAIT1
- B: CLOSE1
- C: UP
- D: DOWN
View Answer
A
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
View Answer
A