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Home Electronics Testing and Troubleshooting Comments

  • Question
  • What is the next step after discovering a faulty gate within an IC?


  • Options
  • A. repair the gate
  • B. resolder the tracks
  • C. replace the IC involved
  • D. recheck the power source

  • Correct Answer
  • replace the IC involved 


  • Testing and Troubleshooting problems


    Search Results


    • 1. The use of triggered sweep when using an oscilloscope provides more accuracy in which area?

    • Options
    • A. frequency
    • B. amplitude
    • C. graticule activity
    • D. timing
    • Discuss
    • 2. The time needed for an output to change as the result of an input change is known as:

    • Options
    • A. noise immunity
    • B. fanout
    • C. propagation delay
    • D. rise time
    • Discuss
    • 3. The range of a valid LOW input is:

    • Options
    • A. 0.0 V to 0.4 V
    • B. 0.4 V to 0.8 V
    • C. 0.4 V to 1.8 V
    • D. 0.4 V to 2.4 V
    • Discuss
    • 4. A digital logic device used as a buffer should have what input/output characteristics?

    • Options
    • A. high input impedance and high output impedance
    • B. low input impedance and high output impedance
    • C. low input impedance and low output impedance
    • D. high input impedance and low output impedance
    • Discuss
    • 5. What quantities must be compatible when interfacing two different logic families?

    • Options
    • A. only the currents
    • B. both the voltages and the currents
    • C. only the voltages
    • D. both the power dissipation and the impedance
    • Discuss
    • 6. A +5 V PCB power source that has been "pulled down" to a +3.4 V level may be due to:

    • Options
    • A. a circuit open
    • B. a faulty regulator
    • C. the half-split method
    • D. a circuit short
    • Discuss
    • 7. Measurement of pulse width should be taken at a 50% mean of the:

    • Options
    • A. overshoot and undershoot
    • B. rise and fall
    • C. damping and ringing
    • D. leading and trailing amplitude
    • Discuss
    • 8. A logic probe is placed on the output of a gate and the display indicator is dim. A logic pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

    • Options
    • A. The dim indication on the logic probe indicates that the supply voltage is probably low.
    • B. The output of the gate appears to be open.
    • C. The LOW indication is the result of a bad ground connection on the logic probe.
    • D. The gate is a tri-state device.
    • Discuss
    • 9. The duty cycle of a pulse is determined by which formula?

    • Options
    • A. Duty Cycle =
    • B. Duty Cycle =
    • C. Duty Cycle =
    • D. Duty Cycle =
    • Discuss
    • 10. The time needed for a pulse to increase from 10% to 90% of its amplitude defines:

    • Options
    • A. pulse width
    • B. propagation delay
    • C. rise time
    • D. duty cycle
    • Discuss


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