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Counters problems

  • 1. List which pins need to be connected together on a 7492 to make a MOD-12 counter.

  • Options
  • A. 1 to 12, 11 to 6, 9 to 7
  • B. 1 to 12, 12 to 6, 11 to 7
  • C. 1 to 12, 9 to 6, 8 to 7
  • D. 1 to 12
    • Discuss
  • 2. How many flip-flops are required to construct a decade counter?

  • Options
  • A. 10
  • B. 8
  • C. 5
  • D. 4
    • Discuss
  • 3. The circuit given below fails to produce data output. The individual flip-flops are checked with a logic probe and pulser, and each checks OK. What could be causing the problem?

    Digital Electronics Counters: The circuit given below fails to produce data output. The individual flip-flops are checked with a l


  • Options
  • A. The data output line may be grounded.
  • B. One of the clock input lines may be open.
  • C. One of the interconnect lines between two stages may have a solder bridge to ground.
  • D. One of the flip-flops may have a solder bridge between its input and Vcc.
    • Discuss
  • 4. The process of designing a synchronous counter that will count in a nonbinary manner is primarily based on:

  • Options
  • A. external logic circuits that decode the various states of the counter to apply the correct logic levels to the J-K inputs
  • B. modifying BCD counters to change states on every second input clock pulse
  • C. modifying asynchronous counters to change states on every second input clock pulse
  • D. elimination of the counter stages and the addition of combinational logic circuits to produce the desired counts
    • Discuss
  • 5. In a VHDL retriggerable edge-triggered one-shot, which condition will not exist when a clock edge occurs?

  • Options
  • A. A trigger edge has occurred and we must load the counter.
  • B. The counter is zero and we need to keep it at zero.
  • C. The shift register is reset.
  • D. The counter is not zero and we need to count down by one.
    • Discuss
  • 6. To operate correctly, starting a ring counter requires:

  • Options
  • A. clearing one flip-flop and presetting all the others.
  • B. clearing all the flip-flops.
  • C. presetting one flip-flop and clearing all the others.
  • D. presetting all the flip-flops.
    • Discuss
  • 7. What type of register is shown below?

    Digital Electronics Counters: What type of register is shown below?


  • Options
  • A. Parallel in/parallel out register
  • B. Serial in/parallel out register
  • C. Serial/parallel-in parallel-out register
  • D. Parallel-access shift register
    • Discuss
  • 8. Which of the following is a type of shift register counter?

  • Options
  • A. Decade
  • B. Binary
  • C. Ring
  • D. BCD
    • Discuss
  • 9. What decimal value is required to produce an output at "X"?

    Digital Electronics Counters: What decimal value is required to produce an output at


  • Options
  • A. 1
  • B. 1 or 4
  • C. 2
  • D. 5
    • Discuss
  • 10. Select the response that best describes the use of the Master Reset on typical 4-bit binary counters.

  • Options
  • A. When MR1 and MR2 are both HIGH, all Qs will be reset to zero.
  • B. When MR1 and MR2 are both HIGH, all Qs will be reset to one.
  • C. MR1 and MR2 are provided to synchronously reset all four flip-flops.
  • D. To enable the count mode, MR1 and MR2 must be held LOW.
    • Discuss

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