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MCQs

Total Questions : 25 | Page 1 of 3 pages
Question 1.  A ripple counter's speed is limited by the propagation delay of:
  1.    each flip-flop
  2.    all flip-flops and gates
  3.    the flip-flops only with gates
  4.    only circuit gates
 Discuss Question
Answer: Option A. -> each flip-flop
Question 2.  To operate correctly, starting a ring counter requires:
  1.    clearing all the flip-flops
  2.    presetting one flip-flop and clearing all the others
  3.    clearing one flip-flop and presetting all the others
  4.    presetting all the flip-flops
 Discuss Question
Answer: Option B. -> presetting one flip-flop and clearing all the others
Question 3.  Synchronous counters eliminate the delay problems encountered with asynchronous (ripple) counters because the:
  1.    input clock pulses are applied only to the first and last stages
  2.    input clock pulses are applied only to the last stage
  3.    input clock pulses are not used to activate any of the counter stages
  4.    input clock pulses are applied simultaneously to each stage
 Discuss Question
Answer: Option D. -> input clock pulses are applied simultaneously to each stage
Question 4.  
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?
  1.    PIPO
  2.    SISO
  3.    SIPO
  4.    PISO
 Discuss Question
Answer: Option B. -> SISO
Question 5.  Which type of device may be used to interface a parallel data format with external equipment's serial format?
  1.    key matrix
  2.    UART
  3.    memory chip
  4.    serial-in, parallel-out
 Discuss Question
Answer: Option B. -> UART
Question 6.  One of the major drawbacks to the use of asynchronous counters is that:
  1.    low-frequency applications are limited because of internal propagation delays
  2.    high-frequency applications are limited because of internal propagation delays
  3.    Asynchronous counters do not have major drawbacks and are suitable for use in high- and low-frequency counting applications.
  4.    Asynchronous counters do not have propagation delays, which limits their use in high-frequency applications.
 Discuss Question
Answer: Option B. -> high-frequency applications are limited because of internal propagation delays
Question 7.  When the output of a tri-state shift register is disabled, the output level is placed in a:
  1.    float state
  2.    LOW state
  3.    high impedance state
  4.    float state and a high impedance state
 Discuss Question
Answer: Option D. -> float state and a high impedance state
Question 8.  A comparison between ring and johnson counters indicates that:
  1.    a ring counter has fewer flip-flops but requires more decoding circuitry
  2.    a ring counter has an inverted feedback path
  3.    a johnson counter has more flip-flops but less decoding circuitry
  4.    a johnson counter has an inverted feedback path
 Discuss Question
Answer: Option D. -> a johnson counter has an inverted feedback path
Question 9.  A sequence of equally spaced timing pulses may be easily generated by which type of counter circuit?
  1.    shift register sequencer
  2.    clock
  3.    johnson
  4.    binary
 Discuss Question
Answer: Option A. -> shift register sequencer
Question 10. . Synchronous construction reduces the delay time of a counter to the delay of __________.
  1.    all flip-flops and gates
  2.    a single flip-flop and a gate
  3.    all flip-flops and gates after a 3 count
  4.    a single gate
 Discuss Question
Answer: Option B. -> a single flip-flop and a gate

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