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Home ‣ Digital Electronics ‣ Logic Gates Comments
  • Question

  • 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

  • Correct Answer
  • truth table 

    • Logic Gates problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. Which of the following logical operations is represented by the + sign in Boolean algebra?

    • Options
    • A. inversion
    • B. AND
    • C. OR
    • D. complementation
      • Discuss
    • 5. 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
    • 6. 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
    • 7. How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

    • Options
    • A. any one of the inputs
    • B. any two of the inputs
    • C. any three of the inputs
    • D. all four inputs
      • Discuss
    • 8. Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?

    • Options
    • A. NOR
    • B. NOT
    • C. NAND
    • D. AND
      • Discuss
    • 9. How many inputs are on the logic gates of a 74HC21 IC?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 10. A CMOS IC operating from a 3-volt supply will consume ________.

    • Options
    • A. less power than a TTL IC
    • B. more power than a TTL IC
    • C. the same power as a TTL IC
    • D. no power at all
      • Discuss

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