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Home ‣ Digital Electronics ‣ Combinational Logic Circuits See What Others Are Saying!
  • Question

  • 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 output of the gate appears to be open.
  • B. The dim indication on the logic probe indicates that the supply voltage is probably low.
  • C. The dim indication is a result of a bad ground connection on the logic probe.
  • D. The gate may be a tristate device.

  • Correct Answer
  • The output of the gate appears to be open. 

    • More questions

    • 1. The major blocks of the frequency counter are the counter, ________, decoder/display, and the timing and control unit.

    • Options
    • A. signal prescaler
    • B. control inputs
    • C. signal generator
    • D. display register
      • Discuss
    • 2. Shift register counters use logic functions to reset the registers when the desired count is reached.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The software used to drive a microprocessor-based system is called FORTRAN.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The time delay called access time, tac, is a measure of the ROM's operating speed.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The 8051 has ________ 16-bit counter/timers.

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 6. The CPU (Central Processing Unit) is composed of memory and outputs.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. Using separate serial inputs for shifting left or shifting right is a major difference between the 74194 and other shift registers.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the rise time.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In the keypad HDL encoder, the ts bit array represents a tristate buffer.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. ________ is a mature technology consisting of numerous subfamilies that have been developed over many years of use.

    • Options
    • A. TTL
    • B. CMOS
    • C. ECL
    • D. None of the above
      • Discuss

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