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Counters
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Question
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.
Correct Answer
The flip-flops change at the same time.
Counters problems
Search Results
1. A modulus-10 counter must have ________.
Options
A. 10 flip-flops
B. flip-flops
C. 2 flip-flops
D. synchronous clocking
Show Answer
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Discuss
Correct Answer: flip-flops
2. 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
Show Answer
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Discuss
Correct Answer: By applying the concept of a counter
3. Which of the following is an invalid output state for an 8421 BCD counter?
Options
A. 1110
B. 0000
C. 0010
D. 0001
Show Answer
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Correct Answer: 1110
4. 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.
Show Answer
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Correct Answer: In general, the counter can be reversed at any point in its counting sequence.
5. 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
Show Answer
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Correct Answer: 7490 is a MOD-10, 7493 is a MOD-16
6. The terminal count of a typical modulus-10 binary counter is ________.
Options
A. 0000
B. 1010
C. 1001
D. 1111
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Correct Answer: 1001
7. 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.
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Correct Answer: Combinational circuits are not triggered by timing pulses, sequential circuits are triggered by timing pulses.
8. The parallel outputs of a counter circuit represent the:
Options
A. parallel data word
B. clock frequency
C. counter modulus
D. clock count
Show Answer
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Correct Answer: clock count
9. 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.
Show Answer
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Correct Answer: Asynchronous events do not occur at the same time.
10. Which is not an example of a truncated modulus?
Options
A. 8
B. 9
C. 11
D. 15
Show Answer
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Discuss
Correct Answer: 8
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