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Home Electronics Testing and Troubleshooting Comments

  • Question
  • Erratic or unexplained digital circuit activity is often due to _________.


  • Options
  • A. a glitch
  • B. a random pulse
  • C. clock frequency changes
  • D. a change in slew rate

  • Correct Answer
  • clock frequency changes 


  • Testing and Troubleshooting problems


    Search Results


    • 1. The control of digital circuits is usually achieved with _________.

    • Options
    • A. random pulses
    • B. clock signals
    • C. sophisticated gating
    • D. selected frequencies
    • Discuss
    • 2. The ideal test equipment to use for locating shorts in digital circuitry is the ________ and _______.

    • Options
    • A. logic probe, clip
    • B. logic pulser, logic probe
    • C. current tracer, logic pulser
    • D. current tracer, logic clip
    • Discuss
    • 3. An open collector output can ________ current, but it cannot ___________________.

    • Options
    • A. sink, source current
    • B. source, sink current
    • C. sink, source voltage
    • D. source, sink voltage
    • Discuss
    • 4. Totem pole outputs _________ be connected __________ because ____________.

    • Options
    • A. can, in parallel, sometimes higher current is required
    • B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
    • C. should, in series, certain applications may require higher output voltage
    • D. can, together, together they can handle larger load currents and higher output voltages
    • Discuss
    • 5. When the output of a standard TTL gate is HIGH, it can ___________________.

    • Options
    • A. sink 16 mA of current from the attached input gates
    • B. source 400 µA of current to no more than 10 attached gates
    • C. source 16 mA of current to no more than 10 attached gates
    • D. sink a maximum of 400 µA from no more than 10 load gates
    • Discuss
    • 6. "Train" and "single" is the mode selection for a _______.

    • Options
    • A. multimeter
    • B. logic probe
    • C. current tracer
    • D. logic pulser
    • Discuss
    • 7. The device that would best aid in open track detection is a(n) ________.

    • Options
    • A. multimeter
    • B. current tracer
    • C. logic probe
    • D. oscilloscope
    • Discuss
    • 8. In order for a logic probe to operate, its red and black leads must first be connected to a ________.

    • Options
    • A. logic clip
    • B. HIGH or TRUE signal
    • C. power source
    • D. logic pulser
    • Discuss
    • 9. The use of a logic probe may be improved through the use of a(n) ________.

    • Options
    • A. logic clip
    • B. frequency counter
    • C. oscilloscope
    • D. current tracer
    • Discuss
    • 10. The results of internal IC failures will usually be noticed during the ______ phase of troubleshooting.

    • Options
    • A. diagnostic
    • B. isolation
    • C. repair
    • D. final test
    • Discuss


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