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- Question
What is the difference between combinational logic and sequential logic?
Options- A. Combinational circuits are not triggered by timing pulses, sequential circuits are triggered by timing pulses.
- B. Combinational and sequential circuits are both triggered by timing pulses.
- C. Neither circuit is triggered by timing pulses.
- Correct Answer
- Combinational circuits are not triggered by timing pulses, sequential circuits are triggered by timing pulses.
- 1. The terminal count of a typical modulus-10 binary counter is ________.
Options- A. 0000
- B. 1010
- C. 1001
- D. 1111 Discuss
- 2. Why can a synchronous counter operate at a higher frequency than a ripple counter?
Options- A. The flip-flops change one after the other.
- B. The flip-flops change at the same time.
- C. A synchronous counter cannot operate at higher frequencies.
- D. A ripple counter is faster. Discuss
- 3. A modulus-10 counter must have ________.
Options- A. 10 flip-flops
- B. flip-flops
- C. 2 flip-flops
- D. synchronous clocking Discuss
- 4. How can a digital one-shot be implemented using HDL?
Options- A. By using a resistor and a capacitor
- B. By applying the concept of a counter
- C. By using a library function
- D. By applying a level trigger Discuss
- 5. Which of the following is an invalid output state for an 8421 BCD counter?
Options- A. 1110
- B. 0000
- C. 0010
- D. 0001 Discuss
- 6. The parallel outputs of a counter circuit represent the:
Options- A. parallel data word
- B. clock frequency
- C. counter modulus
- D. clock count Discuss
- 7. Which of the following statements are true?
Options- A. Asynchronous events do not occur at the same time.
- B. Asynchronous events are controlled by a clock.
- C. Synchronous events do not need a clock to control them.
- D. Only asynchronous events need a control clock. Discuss
- 8. Which is not an example of a truncated modulus?
Options- A. 8
- B. 9
- C. 11
- D. 15 Discuss
- 9. What is the maximum delay that can occur if four flip-flops are connected as a ripple counter and each flip-flop has propagation delays of tPHL = 22 ns and tPLH = 15 ns?
Options- A. 15 ns
- B. 22 ns
- C. 60 ns
- D. 88 ns Discuss
- 10. How many different states does a 3-bit asynchronous counter have?
Options- A. 2
- B. 4
- C. 8
- D. 16 Discuss
Counters problems
Search Results
Correct Answer: 1001
Correct Answer: The flip-flops change at the same time.
Correct Answer: flip-flops
Correct Answer: By applying the concept of a counter
Correct Answer: 1110
Correct Answer: clock count
Correct Answer: Asynchronous events do not occur at the same time.
Correct Answer: 8
Correct Answer: 88 ns
Correct Answer: 8
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