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  • Question

  • 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.

  • Correct Answer
  • The output of the gate appears to be open. 

    • More questions

    • 1. What is the phase angle of a 24 Vac parallel RL circuit when R = 45 ohms and XL = 1100 ohms?

    • Options
    • A. 0.001 degrees
    • B. 2.300 degrees
    • C. 87.600 degrees
    • D. 89.900 degrees
      • Discuss
    • 2. 

      What does R1 equal in the given circuit?


    • Options
    • A. 90 Ω
    • B. 180 Ω
    • C. 200 Ω
    • D. 1.8 kΩ
      • Discuss
    • 3. When current in an inductor starts to change, it cannot react instantly due to:

    • Options
    • A. fixed coil resistance
    • B. eddy current generation
    • C. applied emf of the circuit
    • D. the counter emf of the coil
      • Discuss
    • 4. 

      What is the peak-to-peak voltage of the waveform in the given circuit?


    • Options
    • A. 2 V
    • B. 4 V
    • C. 6 V
    • D. 8 V
      • Discuss
    • 5. 

      The input impedance is ______ for the amplifier in the given circuit. The data sheet values are Zin = 3 MΩ, Zout = 80 Ω, and Aol = 250,000.


    • Options
    • A. 4.7 kΩ
    • B. 22.7 kΩ
    • C. 3 MΩ
    • D. 68.6 kΩ
      • Discuss
    • 6. 

      If R2 opens in the given circuit, what is the voltage at point B?


    • Options
    • A. +19.2 V
    • B. +8.8 V
    • C. +28 V
    • D. ?19.2 V
      • Discuss
    • 7. ________ is an example of read/write memory.

    • Options
    • A. PROM
    • B. EEPROM
    • C. RAM
    • D. MROM
      • Discuss
    • 8. 

      If the Wheatstone bridge is balanced in the given circuit, the voltage between points A and B (VAB) equals the source voltage (VS).


    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The three bipolar transistor circuit configurations are common-base, common-emitter, and emitter-follower.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. 

      In the given circuit, the voltage across the capacitor 1 ms after the switch is closed is 11.61 V.


    • Options
    • A. True
    • B. False
      • Discuss

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