sequential-logic-circuits electronics question and answers -Page first

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Sequential Logic Circuits problems

2. When the output of a tri-state shift register is disabled, the output level is placed in a:
Options
A. float state
B. LOW state
C. high impedance state
D. float state and a high impedance state

3. A comparison between ring and johnson counters indicates that:
Options
A. a ring counter has fewer flip-flops but requires more decoding circuitry
B. a ring counter has an inverted feedback path
C. a johnson counter has more flip-flops but less decoding circuitry
D. a johnson counter has an inverted feedback path

4. What happens to the parallel output word in an asynchronous binary down counter whenever a clock pulse occurs?
Options
A. The output word decreases by 1.
B. The output word decreases by 2.
C. The output word increases by 1.
D. The output word increases by 2.

5. One of the major drawbacks to the use of asynchronous counters is that:
Options
A. low-frequency applications are limited because of internal propagation delays
B. high-frequency applications are limited because of internal propagation delays
C. Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications.
D. Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications.

7. To operate correctly, starting a ring counter requires:
Options
A. clearing all the flip-flops
B. presetting one flip-flop and clearing all the others
C. clearing one flip-flop and presetting all the others
D. presetting all the flip-flops

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