Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q731: In the Down State (D), what direction does the elevator move?
- A: Up
- B: Down
- C: Stationary
- D: Both
View Answer
B
Q732: What happens when the Clear input is set to 0 in the 3-bit Up/Down Counter?
- A: The counter increments
- B: The counter decrements
- C: The counter is reset to 000
- D: The counter stays unchanged
View Answer
C
Q733: Which statement best describes the function of the Clock signal in the elevator system?
- A: Controls door open time
- B: Controls floor requests
- C: Controls state transitions
- D: Controls direction of movement
View Answer
C
Q734: What is the purpose of the ARRIVE signal in the elevator system?
- A: Indicate door is closed
- B: Indicate elevator is on floor
- C: Indicate door is open
- D: Indicate motion has stopped
View Answer
B
Q735: How many states are there in the elevator's state diagram?
- A: 4
- B: 5
- C: 6
- D: 7
View Answer
C
Q736: What is the output signal configuration in Close 1 State (C1)?
- A: Door=0, Motion=0, Dir=0
- B: Door=1, Motion=0, Dir=0
- C: Door=1, Motion=1, Dir=1
- D: Door=0, Motion=1, Dir=1
View Answer
B
Q737: In the state diagram, which state does the elevator move to after Wait 1 State (W1)?
- A: Close 2 State (C2)
- B: Up State (U)
- C: Down State (D)
- D: Close 1 State (C1)
View Answer
D
Q738: How is the next state for Q2 determined in the 3-bit Up/Down Counter?
- A: By X input only
- B: By Q1 and Q0 inputs
- C: By a combination of Q2, Q1, Q0, and X
- D: By Clock signal only
View Answer
C
Q739: How many latches are used to store the external inputs in the modified elevator control circuit?
- A: Two
- B: Three
- C: Four
- D: Five
View Answer
A
Q740: What does the DIR variable indicate in the elevator system?
- A: Motion direction
- B: Current floor
- C: Door status
- D: Request type
View Answer
B