Discussion
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- Question
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
- Correct Answer
- By applying the concept of a counter
- 1. Which of the following is an invalid output state for an 8421 BCD counter?
Options- A. 1110
- B. 0000
- C. 0010
- D. 0001 Discuss
- 2. Which of the following statements best describes the operation of a synchronous up-/down-counter?
Options- A. The counter can count in either direction, but must continue in that direction once started.
- B. The counter can be reversed, but must be reset before counting in the other direction.
- C. In general, the counter can be reversed at any point in its counting sequence.
- D. The count sequence cannot be reversed, once it has begun, without first resetting the counter to zero. Discuss
- 3. What is the difference between a 7490 and a 7493?
Options- A. 7490 is a MOD-10, 7493 is a MOD-16
- B. 7490 is a MOD-16, 7493 is a MOD-10
- C. 7490 is a MOD-12, 7493 is a MOD-16
- D. 7490 is a MOD-10, 7493 is a MOD-12 Discuss
- 4. How many natural states will there be in a 4-bit ripple counter?
Options- A. 4
- B. 8
- C. 16
- D. 32 Discuss
- 5. A BCD counter is a ________.
Options- A. binary counter
- B. full-modulus counter
- C. decade counter
- D. divide-by-10 counter Discuss
- 6. A modulus-10 counter must have ________.
Options- A. 10 flip-flops
- B. flip-flops
- C. 2 flip-flops
- D. synchronous clocking Discuss
- 7. 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
- 8. The terminal count of a typical modulus-10 binary counter is ________.
Options- A. 0000
- B. 1010
- C. 1001
- D. 1111 Discuss
- 9. 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. Discuss
- 10. The parallel outputs of a counter circuit represent the:
Options- A. parallel data word
- B. clock frequency
- C. counter modulus
- D. clock count Discuss
Counters problems
Search Results
Correct Answer: 1110
Correct Answer: In general, the counter can be reversed at any point in its counting sequence.
Correct Answer: 7490 is a MOD-10, 7493 is a MOD-16
Correct Answer: 16
Correct Answer: decade counter
Correct Answer: flip-flops
Correct Answer: The flip-flops change at the same time.
Correct Answer: 1001
Correct Answer: Combinational circuits are not triggered by timing pulses, sequential circuits are triggered by timing pulses.
Correct Answer: clock count
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