Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q521: The state of the flip-flop in an edge-triggered D flip-flop changes ________.
- A: On the falling edge of the clock pulse
- B: On the rising edge of the clock pulse
- C: At the negative edge of the clock pulse
- D: At any change in the clock pulse
View Answer
B
Q522: What does the term 'debouncing' refer to in digital electronics?
- A: Filtering noise from the signal
- B: Stabilizing a signal to avoid multiple transitions due to mechanical switch bounce
- C: Increasing signal strength
- D: Reducing signal interference
View Answer
B
Q523: What is the advantage of using edge-triggered D-flip-flops in a parallel-to-serial converter?
- A: They allow changes in data before the clock transition to be stored
- B: They store data precisely at the clock transition
- C: They require less clock cycles for data conversion
- D: They increase the enable time of the latches
View Answer
B
Q524: What happens to the data stored in a D-flip-flop if the data changes after the clock transition?
- A: The data in the flip-flop is updated
- B: The data in the flip-flop remains stable
- C: The data in the flip-flop is cleared
- D: The flip-flop enters a transparent mode
View Answer
B
Q525: In a D-latch, what mode is the latch in when the enable signal is activated?
- A: Latched Mode
- B: Transparent Mode
- C: Reset Mode
- D: Undefined Mode
View Answer
B
Q526: What is the main demerit of using gated D-latches in parallel-to-serial conversion?
- A: Extended enable time
- B: Increased data loss during conversion
- C: Increased complexity in design
- D: Reduced data stability during conversion
View Answer
A
Q527: How does a D-flip-flop improve the stability of parallel-to-serial conversion compared to a gated D-latch?
- A: By increasing the enable time of the latch
- B: By storing data precisely at the clock transition
- C: By allowing data changes to be reflected immediately
- D: By requiring fewer clock cycles for conversion
View Answer
B
Q528: What is the primary function of a D-flip-flop in synchronizing asynchronous inputs?
- A: To prevent incomplete or partial pulses from appearing
- B: To amplify the input signal
- C: To debounce the input switch
- D: To delay the clock signal
View Answer
A
Q529: How does a D-flip-flop synchronize an asynchronous input signal?
- A: By making the input signal synchronous with the clock
- B: By generating an additional clock pulse
- C: By amplifying the input signal
- D: By increasing the switching frequency
View Answer
A
Q530: What is a primary application of using J-K flip-flops in digital circuits?
- A: To act as a basic storage element
- B: To divide frequency
- C: To perform arithmetic operations
- D: To implement memory cells
View Answer
B