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

  • A NOR gate with one HIGH input and one LOW input:


  • Options
  • A. will output a HIGH
  • B. functions as an AND
  • C. will not function
  • D. will output a LOW

  • Correct Answer
  • will output a LOW 

    • More questions

    • 1. The difference between a PLA and a PAL is:

    • Options
    • A. The PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane.
    • B. The PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane.
    • C. The PAL has more possible product terms than the PLA.
    • D. PALs and PLAs are the same thing.
      • Discuss
    • 2. What should be done to unused inputs on TTL gates?

    • Options
    • A. They should be left disconnected so as not to produce a load on any of the other circuits and to minimize power loading on the voltage source.
    • B. All unused gates should be connected together and tied to V through a 1 k Ω resistor.
    • C. All unused inputs should be connected to an unused output; this will ensure compatible loading on both the unused inputs and unused outputs.
    • D. Unused AND and NAND inputs should be tied to VCC through a 1 kΩ resistor; unused OR and NOR inputs should be grounded.
      • Discuss
    • 3. The truth table shown below describes the operation of a NOR gate.


    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The Boolean equation results from this Karnaugh map.


    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The timing diagram for a two-input NAND gate is shown below. The gate is working correctly.


    • Options
    • A. True
    • B. False
      • Discuss
    • 6. The circuit given below has no output on Q1 when examined with an oscilloscope. All J-K inputs are HIGH, the CLK signal is present, and the Q0 is toggling. The C input of FF1 is a constant LOW. What could be causing the problem?


    • Options
    • A. The Q0 output should be connected to the J input of FF1.
    • B. The output of FF0 may be shorted to ground.
    • C. The input of FF1 may be shorted to ground.
    • D. Either the output of FF0 or the input of FF1 may be shorted to ground.
      • Discuss
    • 7. In a real project, the first step of definition often involves some ________ on the part of the project manager.

    • Options
    • A. time
    • B. skill
    • C. research
    • D. management
      • Discuss
    • 8. The control and arithmetic/logic units are often considered as one unit called the ________.

    • Options
    • A. central processing unit
    • B. inputs and outputs
    • C. microcomputer
    • D. arithmetic/logic unit
      • Discuss
    • 9. The basic comparator evaluates two binary strings bit by bit and always outputs a 1.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The proliferation of small handheld consumer equipment such as digital video cameras, cellular phones, handheld computers (________), portable audio systems, and other devices has created a need for logic circuits in very small packages.

    • Options
    • A. HDLs
    • B. GDAs
    • C. PDAs
    • D. TTLs
      • Discuss

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