Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q541: What happens when both PRE and CLR inputs are set to 1?
- A: Flip-flop remains unchanged
- B: Flip-flop resets
- C: Flip-flop presets
- D: Clocked operation occurs
View Answer
D
Q542: What type of flip-flop is the 74HC74?
- A: Master-Slave J-K flip-flop
- B: Dual Positive-Edge D flip-flop
- C: Dual Negative-Edge D flip-flop
- D: Single Positive-Edge D flip-flop
View Answer
B
Q543: What is the main disadvantage of Master-Slave flip-flops compared to edge-triggered flip-flops?
- A: They operate on half clock
- B: They consume more power
- C: They are more complex
- D: They have longer delay
View Answer
A
Q544: What is the output of a Master-Slave flip-flop during the positive half of the clock cycle?
- A: Changes with clock signal
- B: Remains unchanged
- C: Resets to zero
- D: Presets to one
View Answer
B
Q545: What does the Propagation Delay tPLH measure?
- A: Time from clock to output
- B: Time from input to clock
- C: Time from low to high output
- D: Time from high to low output
View Answer
C
Q546: How is the Set-up Time defined for a flip-flop?
- A: Minimum time input is held
- B: Time between input changes
- C: Time for input to stabilize
- D: Time for clock to transition
View Answer
A
Q547: What is the Hold Time in a flip-flop?
- A: Time after clock transition
- B: Time before clock transition
- C: Time between two clock pulses
- D: Time between input changes
View Answer
A
Q548: What is the Maximum Clock Frequency of a flip-flop?
- A: Highest frequency for inputs
- B: Highest frequency for outputs
- C: Highest reliable clock rate
- D: Highest transition rate
View Answer
C
Q549: Following Is the circuit diagram of mono-stable device which gate will be replaced by the red colored rectangle in the circuit.
- A: AND
- B: NAND
- C: NOR
- D: XNOR
View Answer
C
Q550: What determines the unstable state duration in a Mono-stable device?
- A: Clock input
- B: Trigger pulse
- C: Resistor and Capacitor
- D: Feedback loop
View Answer
C