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Counters problems

  • 1. An asynchronous binary up counter, made from a series of leading edge-triggered flip-flops, can be changed to a down counter by ________.

  • Options
  • A. taking the output on the other side of the flip-flops ( instead of Q)
  • B. clocking of each succeeding flip-flop from the other side ( instead of Q)
  • C. changing the flip-flops to trailing edge triggering
  • D. all of the above
    • Discuss
  • 2. A sequential circuit design is used to ________.

  • Options
  • A. count up
  • B. count down
  • C. decode an end count
  • D. count in a random order
    • Discuss
  • 3. ________ is the output frequency of the counter shown below.

    Digital Electronics Counters: ________ is the output frequency of the counter shown below.


  • Options
  • A. 4 MHz
  • B. 20 kHz
  • C. 210.5 kHz
  • D. 800 Hz
    • Discuss
  • 4. One method of troubleshooting involves ________ the circuit under test with a ________ or ________ and then observing the output to check for proper bit patterns.

  • Options
  • A. checking, voltmeter, ohmmeter
  • B. exercising, stimulus, test pattern
  • C. testing, scope, logic analyzer
  • D. smashing, hammer, axe
    • Discuss
  • 5. The given circuit represents a(n) ________.

    Digital Electronics Counters: The given circuit represents a(n) ________.


  • Options
  • A. four-bit binary counter
  • B. asynchronous BCD decade counter
  • C. synchronous BCD decade counter
  • D. BCD-to-decimal decoder
    • Discuss
  • 6. Many parallel counters use ________ presetting whereby the counter is preset on the active transition of the same clock signal that is used for counting.

  • Options
  • A. feedback
  • B. synchronous
  • C. ripple
  • D. asynchronous
    • Discuss
  • 7. The technique used by one-shots to respond to an edge rather than a level is called ________.

  • Options
  • A. level management
  • B. edge triggering
  • C. trigger input
  • D. edge trapping
    • Discuss
  • 8. Assume you want to determine the timing diagram for a 4-bit counter using an oscilloscope. The best choice for an oscilloscope trigger signal is ________.

  • Options
  • A. the most significant bit (MSB)
  • B. the least significant bit (LSB)
  • C. the clock signal
  • D. from a composite of the MSB and LSB
    • Discuss
  • 9. Asynchronous counters are often called ________ counters.

  • Options
  • A. toggle
  • B. ripple
  • C. binary
  • D. flip-flop
    • Discuss
  • 10. Assume a 4-bit ripple counter has a failure in the second flip-flop such that it "locks up." The third and fourth stages will ________.

  • Options
  • A. continue to count with correct outputs
  • B. continue to count but have incorrect outputs
  • C. stop counting
  • D. turn into molten silicon
    • Discuss

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