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Counters problems

  • 1. In general, when using a scope to troubleshoot digital systems the instrument should be triggered by ________.

  • Options
  • A. the A channel or channel 1
  • B. the vertical input mode, when using more than one channel
  • C. the system clock
  • D. line sync, in order to observe troublesome power line glitches
    • Discuss
  • 2. ________ is the modulus of the counter shown below.

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


  • Options
  • A. 200
  • B. 19
  • C. 0.005
  • D. 5000
    • Discuss
  • 3. The circuit shown below is a ________.

    Digital Electronics Counters: The circuit shown below is a ________.


  • Options
  • A. parallel in/serial out register
  • B. serial in/parallel load register
  • C. multiplexer
  • D. demultiplexer
    • Discuss
  • 4. The minimum number of flip-flops that can be used to construct a modulus-5 counter is ________.

  • Options
  • A. 3
  • B. 5
  • C. 8
  • D. 10
    • Discuss
  • 5. Referring to the function table given below, taking the CLEAR, S1, and S0 inputs all HIGH ________.

    Digital Electronics Counters: Referring to the function table given below, taking the CLEAR, S1, and S0 input


  • Options
  • A. will inhibit the operation of the register
  • B. will reset the parallel registers and inhibit the serial data inputs
  • C. will cause the parallel data inputs to be loaded and passed to the parallel data outputs
  • D. will depend on what values are loaded into the parallel data inputs
    • Discuss
  • 6. A D flip-flop can be made to toggle by ________.

  • Options
  • A. connecting to Q to D
  • B. connecting to Q to D
  • C. connecting D low
  • D. connecting D high
    • Discuss
  • 7. The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the correct output waveform for QB is shown by waveform ________.

    Digital Electronics Counters: The counter circuit and associated waveforms shown below are for a(n) ________ counter, and the corr


  • Options
  • A. synchronous, a
  • B. asynchronous, b
  • C. synchronous, c
  • D. asynchronous, d
    • Discuss
  • 8. In VHDL, if we need to remember a value it must be stored in a ________.

  • Options
  • A. function
  • B. type declaration
  • C. variable
  • D. process
    • Discuss
  • 9. The circuit shown below is a ________.

    Digital Electronics Counters: The circuit shown below is a ________.


  • Options
  • A. Johnson counter
  • B. ring counter
  • C. decade counter
  • D. BCD counter
    • Discuss
  • 10. Modulus refers to ________.

  • Options
  • A. a method used to fabricate decade counter units
  • B. the modulus of elasticity, or the ability of a circuit to be stretched from one mode to another
  • C. an input on a counter that is used to set the counter state, such as UP/DOWN
  • D. the maximum number of states in a counter sequence
    • Discuss

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