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Counters
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Question
How many different states does a 2-bit asynchronous counter have?
Options
A. 1
B. 2
C. 4
D. 8
Correct Answer
4
Counters problems
Search Results
1. A 4-bit up/down binary counter is in the DOWN mode and in the 1100 state. To what state does the counter go on the next clock pulse?
Options
A. 1101
B. 1011
C. 1111
D. 0000
Show Answer
Scratch Pad
Discuss
Correct Answer: 1011
2. What is meant by parallel load of a counter?
Options
A. Each FF is loaded with data on a separate clock.
B. The counter is cleared.
C. All FFs are preset with data.
Show Answer
Scratch Pad
Discuss
Correct Answer: All FFs are preset with data.
3. A 12 MHz clock frequency is applied to a cascaded counter containing a modulus-5 counter, a modulus-8 counter, and a modulus-10 counter. The lowest output frequency possible is ________.
Options
A. 10 kHz
B. 20 kHz
C. 30 kHz
D. 60 kHz
Show Answer
Scratch Pad
Discuss
Correct Answer: 30 kHz
4. A multiplexed display being driven by a logic circuit:
Options
A. accepts data inputs from one line and passes this data to multiple output lines
B. accepts data inputs from several lines and allows one of them at a time to pass to the output
C. accepts data inputs from multiple lines and passes this data to multiple output lines
D. accepts data inputs from several lines and multiplexes this input data to four BCD lines
Show Answer
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Discuss
Correct Answer: accepts data inputs from several lines and allows one of them at a time to pass to the output
5. Which of the following groups of logic devices would be the minimum required for a MOD-64 synchronous counter?
Options
A. Five flip-flops, three AND gates
B. Seven flip-flops, five AND gates
C. Four flip-flops, ten AND gates
D. Six flip-flops, four AND gates
Show Answer
Scratch Pad
Discuss
Correct Answer: Six flip-flops, four AND gates
6. Synchronous construction reduces the delay time of a counter to the delay of:
Options
A. all flip-flops and gates
B. all flip-flops and gates after a 3 count
C. a single gate
D. a single flip-flop and a gate
Show Answer
Scratch Pad
Discuss
Correct Answer: a single flip-flop and a gate
7. A BCD counter is a ________.
Options
A. binary counter
B. full-modulus counter
C. decade counter
D. divide-by-10 counter
Show Answer
Scratch Pad
Discuss
Correct Answer: decade counter
8. How many natural states will there be in a 4-bit ripple counter?
Options
A. 4
B. 8
C. 16
D. 32
Show Answer
Scratch Pad
Discuss
Correct Answer: 16
9. 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
Scratch Pad
Discuss
Correct Answer: 7490 is a MOD-10, 7493 is a MOD-16
10. 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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Discuss
Correct Answer: In general, the counter can be reversed at any point in its counting sequence.
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