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Home ‣ Digital Electronics ‣ Logic Gates Comments
  • Question

  • Which of the following logical operations is represented by the + sign in Boolean algebra?


  • Options
  • A. inversion
  • B. AND
  • C. OR
  • D. complementation

  • Correct Answer
  • OR 

    • Logic Gates problems

    Search Results

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

    • Options
    • A. X = AB
    • B. X = ABC
    • C. X = A + B + C
    • D. X = AB + C
      • Discuss
    • 2. If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be?

    • Options
    • A. All inputs must be LOW.
    • B. All inputs must be HIGH.
    • C. At least one input must be LOW.
    • D. At least one input must be HIGH.
      • Discuss
    • 3. If the input to a NOT gate is A and the output is X, then ________.

    • Options
    • A. X = A
    • B.
    • C. X = 0
    • D. none of the above
      • Discuss
    • 4. The term "hex inverter" refers to:

    • Options
    • A. an inverter that has six inputs
    • B. six inverters in a single package
    • C. a six-input symbolic logic device
    • D. an inverter that has a history of failure
      • Discuss
    • 5. When reading a Boolean expression, what does the word "NOT" indicate?

    • Options
    • A. the same as
    • B. inversion
    • C. high
    • D. low
      • Discuss
    • 6. The logic gate that will have a LOW output when any one of its inputs is HIGH is the:

    • Options
    • A. NAND gate
    • B. AND gate
    • C. NOR gate
    • D. OR gate
      • Discuss
    • 7. A logic probe is again applied to the pins of a 7421 IC with the following results. Is there a problem with the circuit and if so, what is the problem?


    • Options
    • A. Pin 6 should be ON.
    • B. Pin 8 should be ON.
    • C. Pin 8 should be pulsing.
    • D. no problem
      • Discuss
    • 8. The basic types of programmable arrays are made up of ________.

    • Options
    • A. AND gates
    • B. OR gates
    • C. NAND and NOR gates
    • D. AND gates and OR gates
      • Discuss
    • 9. The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

    • Options
    • A. Boolean constant
    • B. Boolean variable
    • C. truth table
    • D. input logic function
      • Discuss
    • 10. If a 3-input NOR 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

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