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

  • An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?


  • Options
  • A. Current tracer
  • B. Logic probe
  • C. Oscilloscope
  • D. Logic analyzer

  • Correct Answer
  • Current tracer 

    • More questions

    • 1. The content of a simple programmable logic device (PLD) consists of:

    • Options
    • A. fuse-link arrays
    • B. thousands of basic logic gates
    • C. advanced sequential logic functions
    • D. thousands of basic logic gates and advanced sequential logic functions
      • Discuss
    • 2. A counter has a specified sequence of states, but a shift register does not.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. ROMs are used to store data on a permanent basis.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. A microprocessor with the necessary support circuits will include at least two memory ICs: ROM or EPROM, and a RAM.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. What is the acquisition time of the AD1154 sample-and-hold IC?

    • Options
    • A. 1.5 µs
    • B. 2.5 µs
    • C. 3.5 µs
    • D. 4.5 µs
      • Discuss
    • 6. Which of the figures shown below represents the exclusive-NOR gate?


    • Options
    • A. a
    • B. b
    • C. c
    • D. d
      • Discuss
    • 7. The device that places its input data onto one of several outputs is a ________.

    • Options
    • A. demultiplexer
    • B. multiplexer
    • C. comparator
    • D. counter
      • Discuss
    • 8. Digital computers use an easier method to subtract binary numbers, called one's complement.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. With interrupt-driven I/O, if two or more devices request service at the same time, ________.

    • Options
    • A. the device closest to the CPU gets priority
    • B. the device that is fastest gets priority
    • C. the device assigned the highest priority is serviced first
    • D. the system is likely to crash
      • Discuss
    • 10. Asynchronous counters are often called ________ counters.

    • Options
    • A. toggle
    • B. ripple
    • C. binary
    • D. flip-flop
      • Discuss

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