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Home ‣ Digital Electronics ‣ Logic Gates Comments
  • Question

  • A logic probe is placed on the output of a gate and the display indicator is dim. A 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 dim indication is the result of a bad ground connection on the logic probe.
  • D. The gate is a tristate device.

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

    • Logic Gates problems

    Search Results

    • 1. What is the circuit number of the IC that contains four two-input AND gates in standard TTL?

    • Options
    • A. 7402
    • B. 7404
    • C. 7408
    • D. 7432
      • Discuss
    • 2. The AND function can be used to ________ and the OR function can be used to ________ .

    • Options
    • A. enable, disable
    • B. disable, enable
    • C. enable or disable, enable or disable
    • D. detect, invert
      • Discuss
    • 3. The output of a NOR gate is HIGH if ________.

    • Options
    • A. all inputs are HIGH
    • B. any input is HIGH
    • C. any input is LOW
    • D. all inputs are LOW
      • Discuss
    • 4. If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

    • Options
    • A. 1
    • B. 2
    • C. 7
    • D. 8
      • Discuss
    • 5. Fan-out is specified in terms of ________.

    • Options
    • A. voltage
    • B. current
    • C. wattage
    • D. unit loads
      • Discuss
    • 6. What is the Boolean expression for a three-input AND gate?

    • Options
    • A. X = A + B + C
    • B. X = A · B · C
    • C. A ? B ? C
    • D. A $ B $ C
      • Discuss
    • 7. Write the Boolean expression for an inverter logic gate with input C and output Y.

    • Options
    • A. Y = C
    • B. Y =
      • Discuss
    • 8. When used with an IC, what does the term "QUAD" indicate?

    • Options
    • A. 2 circuits
    • B. 4 circuits
    • C. 6 circuits
    • D. 8 circuits
      • Discuss
    • 9. If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

    • Options
    • A. 1
    • B. 2
    • C. 7
    • D. 8
      • Discuss
    • 10. A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem with the chip and if so, what is the problem?


    • Options
    • A. Pin 6 should be ON.
    • B. Pin 6 should be pulsing.
    • C. Pin 8 should be ON.
    • D. no problem
      • Discuss

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