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Home ‣ Digital Electronics ‣ Signals and Switches Comments
  • Question

  • The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • Signals and Switches problems

    Search Results

    • 1. How many 2-input NOR gates does it take to produce a 2-input NAND gate?

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 2. To implement the expression , it takes one OR gate and ________.

    • Options
    • A. three AND gates and three inverters
    • B. three AND gates and four inverters
    • C. three AND gates
    • D. one AND gate
      • Discuss
    • 3. The following waveform pattern is for a(n) ________.


    • Options
    • A. 2-input AND gate
    • B. 2-input OR gate
    • C. Exclusive-OR gate
    • D. None of the above
      • Discuss
    • 4. Implementing the expression with NOR logic, we get:


    • Options
    • A. (A)
    • B. (B)
    • C. (C)
    • D. (D)
      • Discuss
    • 5. How many NOT gates are required to implement the Boolean expression, ?

    • Options
    • A. 1
    • B. 2
    • C. 4
    • D. 5
      • Discuss
    • 6. Which device(s) have almost ideal ON and OFF resistances?

    • Options
    • A. electromechanical relays
    • B. manual switches
    • C. semiconductor devices (diodes and transistors)
    • D. electromechanical relays and manual switches
      • Discuss
    • 7. TTL logic chips must have connections to Vcc and ground, even if all inputs and outputs are properly used and tied to valid signals.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.

    • Options
    • A. time, y, voltage, x
    • B. voltage, y, time, x
      • Discuss
    • 9. A diode placed in parallel across a relay coil serves what function?

    • Options
    • A. to regulate input voltage
    • B. to protect the coil from arcing
    • C. to ensure most of the current passes through the coil
    • D. to reduce arcing across the relay contacts
      • Discuss
    • 10. The period of a waveform is the percentage of time the signal is HIGH.

    • Options
    • A. True
    • B. False
      • Discuss

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