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  • Question

  • The circuit given below fails to function; the inputs are checked with a logic probe and the following indications are obtained: CLK, J1, J2, J3, K1, K2, and K3 are pulsing. Q and The circuit given below fails to function; the inputs are checked with a logic probe and the followi are HIGH. The circuit given below fails to function; the inputs are checked with a logic probe and the followi and PRE are LOW. What could be causing the problem?

    The circuit given below fails to function; the inputs are checked with a logic probe and the followi


  • Options
  • A. There is no problem.
  • B. The clock should be held HIGH.
  • C. The PRE is stuck LOW.
  • D. The CLR is stuck HIGH.

  • Correct Answer
  • The PRE is stuck LOW. 

    • More questions

    • 1. The concurrent section of the hardware description is where the ________ are interconnected.

    • Options
    • A. functions
    • B. components
    • C. circuits
    • D. macrofunctions
      • Discuss
    • 2. Output 6 of a 74138 octal decoder is selected when it is enabled by a data input of:

      A0 = 1
      A1 = 1
      A2 = 0


    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Assume a ROM to be tested is compared with a known good ROM. If the checksums differ, the ROM is ________.

    • Options
    • A. very likely to be good
    • B. definitely good
    • C. very likely to be bad
    • D. definitely bad
      • Discuss
    • 4. The most common TTL series ICs are:

    • Options
    • A. E-MOSFET
    • B. 7400
    • C. quad
    • D. AC00
      • Discuss
    • 5. Microcontrollers often have:

    • Options
    • A. CPUs
    • B. RAM
    • C. ROM
    • D. all of the above
      • Discuss
    • 6. Before an SOP implementation, the expression would require a total of how many gates?

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 5
      • Discuss
    • 7. The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

      A < B is 1
      A = B is 0
      A > B is 1


    • Options
    • A. True
    • B. False
      • Discuss
    • 8. How many outputs are on a BCD decoder?

    • Options
    • A. 4
    • B. 16
    • C. 8
    • D. 10
      • Discuss
    • 9. The GAL16V8 has eight dedicated input pins.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The Boolean expression AB + CD is an example of ________.

    • Options
    • A. PAL
    • B. GAL
    • C. SOP
    • D. POS
      • Discuss

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