Digital Logic and Design MCQs with Answers
Practice important Digital Logic and Design MCQs with answers and explanations.
Chapter: 26
Q561:
How many unique states can a 3-bit Asynchronous counter sequence through?
A. 4
B. 6
C. 8
D. 16
Correct Answer:
C
Chapter: 26
Q562:
What is the effect of propagation delay in an Asynchronous counter?
A. Speeds up counting
B. Causes timing errors
C. Reduces power consumption
D. Increases clock frequency
Correct Answer:
B
Chapter: 26
Q563:
A decade counter is __________.
A. Mod-3 counter
B. Mod-5 counter
C. Mod-8 counter
D. Mod-10 counter
Correct Answer:
D
Chapter: 26
Q564:
____________ is said to occur when multiple internal variables change due to change in one input variable
A. Clock Skew
B. Race condition
C. Hold delay
D. Hold and Wait
Correct Answer:
B
Chapter: 26
Q565:
What is the frequency of the output signal of a Mod-10 counter relative to the input clock signal?
A. "1/2"
B. "1/4"
C. "1/10"
D. "1/16"
Correct Answer:
C
Chapter: 26
Q566:
What does the output of a Mod-6 counter look like?
A. Counts from 0 to 5
B. Counts from 0 to 6
C. Counts from 0 to 7
D. Counts from 0 to 9
Correct Answer:
A
Chapter: 26
Q567:
How can Asynchronous counters be made to function at high clock frequencies?
A. By increasing clock skew
B. By reducing flip-flop delay
C. By using synchronous counters
D. By adding more flip-flops
Correct Answer:
C
Chapter: 26
Q568:
How is a Mod-50 counter typically implemented using 74LS93A ICs?
A. By cascading two 74LS93As
B. Using a single 74LS93A
C. Using an external clock
D. By using one flip-flop
Correct Answer:
A
Chapter: 26
Q569:
What type of signal is generated by a Mod-n counter?
A. n times input frequency
B. n divided by input frequency
C. 1/nth of input clock frequency
D. 2n times input frequency
Correct Answer:
C
Chapter: 27
Q570:
What happens when a down counter reaches its maximum count value?
A. Resets to binary zero
B. Continues counting
C. Stops counting
D. Resets to maximum count value
Correct Answer:
D
Chapter: 27
Q571:
How is a Down-counter implemented?
A. By using a different clock signal
B. By reversing the Q outputs
C. By connecting Q output to next flip-flop
D. By using synchronous flip-flops
Correct Answer:
C
Chapter: 27
Q572:
What does a Down-counter do in a truncated sequence?
A. Counts up to a predefined value
B. Counts down to zero
C. Counts down to a predefined value
D. Repeats counting sequence
Correct Answer:
C
Chapter: 27
Q573:
How is a Down-counter configured to count a truncated sequence?
A. By resetting to zero
B. By presetting to maximum count
C. By skipping intermediate values
D. By clearing the flip-flops at zero
Correct Answer:
B
Chapter: 27
Q574:
What is the primary drawback of Asynchronous counters in high-frequency applications?
A. High power consumption
B. Propagation delay
C. High cost
D. Large size
Correct Answer:
B
Chapter: 27
Q575:
What is used to avoid timing problems in counters with multiple bits?
A. Asynchronous counters
B. Increased clock speed
C. Synchronous counters
D. Lower clock frequency
Correct Answer:
C
Chapter: 27
Q576:
How do Synchronous counters differ from Asynchronous counters?
A. Use separate clock signals
B. Use a common clock signal
C. Require more flip-flops
D. Cannot be used for high frequencies
Correct Answer:
B
Chapter: 27
Q577:
In a 2-bit Synchronous counter, what happens when F0 toggles?
A. F1 remains unchanged
B. F1 toggles immediately
C. F0 resets to zero
D. Both F0 and F1 toggle simultaneously
Correct Answer:
A
Chapter: 27
Q578:
What is needed in a 3-bit Synchronous counter for proper operation?
A. A flip-flop with delayed output
B. An OR gate
C. An AND gate
D. A T flip-flop
Correct Answer:
C
Chapter: 27
Q579:
How many flip-flops are used in a 4-bit Synchronous counter?
A. Two
B. Three
C. Four
D. Five
Correct Answer:
C
Chapter: 27
Q580:
What is the role of the AND gate in a multi-bit Synchronous counter?
A. Clears the counter
B. Sets all flip-flops to zero
C. Ensures correct count sequence
D. Connects clock signals
Correct Answer:
C