Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Multiple Choice Questions
Q621: What does a Karnaugh Map help to simplify in Boolean algebra?
- A: Logic gates
- B: Boolean expressions
- C: Arithmetic operations
- D: Digital circuits
View Answer
B
Q622: How many cells are there in a 3-variable Karnaugh Map?
- A: 4
- B: 8
- C: 16
- D: 32
View Answer
C
Q623: At time interval t9, what does the RCO signal indicate in the digital clock?
- A: Terminal count of the tens counter
- B: Terminal count of the units counter
- C: Reset signal for the clock
- D: Start signal for the next counter
View Answer
B
Q624: When does the units counter recycle to 0000 in the digital clock sequence?
- A: At interval t10
- B: At interval t11
- C: At interval t19
- D: At interval t1
View Answer
A
Q625: What is the role of the RCO signal in the digital clock circuit?
- A: Enable the next counter
- B: Reset the units counter
- C: Increment the tens counter
- D: Deactivate the J-K flip-flop
View Answer
A
Q626: How is the J-K flip-flop triggered in the hours unit counter circuit?
- A: By a positive edge clock transition
- B: By a negative edge clock transition
- C: By a reset signal
- D: By an RCO signal
View Answer
B
Q627: When does the J-K flip-flop output Q change to logic 1 in the hours counter circuit?
- A: At interval t9
- B: At interval t10
- C: At interval t12
- D: At interval t13
View Answer
A
Q628: What happens at interval t60 in the frequency counter timing diagram?
- A: The units counter recycles to 0000
- B: The tens counter increments to 0110
- C: The NAND gate output is set to logic 1
- D: The sampling interval is disabled
View Answer
B
Q629: How is the frequency of an unknown signal calculated using a frequency counter?
- A: By counting the input signal pulses and dividing by sampling interval
- B: By measuring the input signal voltage
- C: By calculating the period of the signal
- D: By adjusting the counter output
View Answer
A
Q630: What is the purpose of the crystal oscillator in the frequency counter circuit?
- A: To generate accurate timing signals
- B: To amplify the input signal
- C: To reset the counter
- D: To display the frequency
View Answer
A