logo

CuriousTab

CuriousTab

Discussion

Home ‣ Digital Electronics ‣ Logic Gates Comments
  • Question

  • 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?

    A logic probe is again applied to the pins of a 7421 IC with the following results. Is there a probl


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

  • Correct Answer
  • no problem 

    • Logic Gates problems

    Search Results

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

    • Options
    • A. inversion
    • B. AND
    • C. OR
    • D. complementation
      • Discuss
    • 3. 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
    • 4. 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
    • 5. 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
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.