Sequential Logic Circuits Questions and Answers
Sequential Logic Circuits questions with answers help you understand how digital systems store and process information using flip-flops, counters, and registers. These circuits are vital in designing memory devices and control systems. Practicing logical reasoning questions and answers based on sequential circuits enhances your analytical and technical aptitude, which is crucial for GATE, BARC, and ISRO exams. By solving reasoning questions with explanations, students can easily master concepts like clock signals, feedback mechanisms, and state transitions. Such practice improves both conceptual clarity and speed in competitive technical exams.
Sequential Logic Circuits
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14 questions
1. A ripple counter's speed is limited by the propagation delay of:
- each flip-flop
- all flip-flops and gates
- the flip-flops only with gates
- only circuit gates
2. To operate correctly, starting a ring counter requires:
- clearing all the flip-flops
- presetting one flip-flop and clearing all the others
- clearing one flip-flop and presetting all the others
- presetting all the flip-flops
3. What type of register would shift a complete binary number in one bit at a time and shift all the stored bits out one bit at a time?
- PIPO
- SISO
- SIPO
- PISO
4. Synchronous counters eliminate the delay problems encountered with asynchronous (ripple) counters because the:
- input clock pulses are applied only to the first and last stages
- input clock pulses are applied only to the last stage
- input clock pulses are not used to activate any of the counter stages
- input clock pulses are applied simultaneously to each stage
5. One of the major drawbacks to the use of asynchronous counters is that:
- low-frequency applications are limited because of internal propagation delays
- high-frequency applications are limited because of internal propagation delays
- Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications.
- Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications.
6. Which type of device may be used to interface a parallel data format with external equipment's serial format?
- key matrix
- UART
- memory chip
- serial-in, parallel-out
7. When the output of a tri-state shift register is disabled, the output level is placed in a:
- float state
- LOW state
- high impedance state
- float state and a high impedance state
8. A comparison between ring and johnson counters indicates that:
- a ring counter has fewer flip-flops but requires more decoding circuitry
- a ring counter has an inverted feedback path
- a johnson counter has more flip-flops but less decoding circuitry
- a johnson counter has an inverted feedback path
9. A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?
- shift register sequencer
- clock
- johnson
- binary
10. What is meant by parallel-loading the register?
- Shifting the data in all flip-flops simultaneously
- Loading data in two of the flip-flops
- Loading data in all four flip-flops at the same time
- Momentarily disabling the synchronous SET and RESET inputs