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Logic Gates problems


  • 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. 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.
  • Discuss
  • 3. 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
  • 4. Write the Boolean expression for an inverter logic gate with input C and output Y.

  • Options
  • A. Y = C
  • B. Y =
  • Discuss
  • 5. 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
  • 6. 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
  • 7. 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?

    Digital Electronics Logic Gates: A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem w


  • Options
  • A. Pin 6 should be ON.
  • B. Pin 6 should be pulsing.
  • C. Pin 8 should be ON.
  • D. no problem
  • Discuss
  • 8. 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
  • 9. 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
  • Discuss
  • 10. 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

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