Sequential Logic Circuits Questions and Answers

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Q1
A ripple counter's speed is limited by the propagation delay of:
  • A each flip-flop
  • B all flip-flops and gates
  • C the flip-flops only with gates
  • D only circuit gates
Answer: Option A
Q2
To operate correctly, starting a ring counter requires:
  • 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
Answer: Option B
Q3
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?
  • A PIPO
  • B SISO
  • C SIPO
  • D PISO
Answer: Option B
Q4
Synchronous counters eliminate the delay problems encountered with asynchronous (ripple) counters because the:
  • A input clock pulses are applied only to the first and last stages
  • B input clock pulses are applied only to the last stage
  • C input clock pulses are not used to activate any of the counter stages
  • D input clock pulses are applied simultaneously to each stage
Answer: Option D
Q5
One of the major drawbacks to the use of asynchronous counters is that:
  • 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.
Answer: Option B
Q6
Which type of device may be used to interface a parallel data format with external equipment's serial format?
  • A key matrix
  • B UART
  • C memory chip
  • D serial-in, parallel-out
Answer: Option B
Q7
When the output of a tri-state shift register is disabled, the output level is placed in a:
  • A float state
  • B LOW state
  • C high impedance state
  • D float state and a high impedance state
Answer: Option D
Q8
A comparison between ring and johnson counters indicates that:
  • 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
Answer: Option D
Q9
A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?
  • A shift register sequencer
  • B clock
  • C johnson
  • D binary
Answer: Option A
Q10
What is meant by parallel-loading the register?
  • A Shifting the data in all flip-flops simultaneously
  • B Loading data in two of the flip-flops
  • C Loading data in all four flip-flops at the same time
  • D Momentarily disabling the synchronous SET and RESET inputs
Answer: Option C

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