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Home ‣ Digital Electronics ‣ Logic Gates Comments
  • Question

  • The Boolean expression for a 3-input OR gate is ________.


  • Options
  • A. X = A + B
  • B. X = A + B + C
  • C. X = ABC
  • D. X = A + BC

  • Correct Answer
  • X = A + B + C 

    • Logic Gates problems

    Search Results

    • 1. What is the Boolean expression for a four-input OR gate?

    • Options
    • A. Y = A + B + C + D
    • B. Y = A· B · C · D
    • C. Y = A ? B ? C ? D
    • D. Y = A $ B $ C $ D
      • Discuss
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. Write the Boolean expression for an inverter logic gate with input C and output Y.

    • Options
    • A. Y = C
    • B. Y =
      • Discuss
    • 6. The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

    • Options
    • A. A = 1, B = 1, C = 0
    • B. A = 0, B = 0, C = 0
    • C. A = 1, B = 1, C = 1
    • D. A = 1, B = 0, C = 1
      • Discuss
    • 7. The NOR logic gate is the same as the operation of the ________ gate with an inverter connected to the output.

    • Options
    • A. OR
    • B. AND
    • C. NAND
    • D. none of the above
      • Discuss
    • 8. From the truth table for a three-input NOR gate, what is the only condition of inputs A, B, and C that will make the output X high?

    • Options
    • A. A = 1, B = 1, C = 1
    • B. A = 1, B = 0, C = 0
    • C. A = 0, B = 0, C = 1
    • D. A = 0, B = 0, C = 0
      • Discuss
    • 9. The output of an exclusive-OR gate is HIGH if ________.

    • Options
    • A. all inputs are LOW
    • B. all inputs are HIGH
    • C. the inputs are unequal
    • D. none of the above
      • Discuss
    • 10. The output of an exclusive-NOR gate is HIGH if ________.

    • Options
    • A. the inputs are equal
    • B. one input is HIGH, and the other input is LOW
    • C. the inputs are unequal
    • D. none of the above
      • Discuss

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