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Home Digital Electronics Signals and Switches Comments

  • Question
  • The period of a waveform is the percentage of time the signal is HIGH.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 


  • Signals and Switches problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. The abbreviation NO, when used with respect to electromechanical relays, stands for not operational.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. What is the output voltage from the circuit in the given figure?


    • Options
    • A. +15 V
    • B. +12 V
    • C. +3 V
    • D. 0 V
    • Discuss
    • 7. Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the:

    • Options
    • A. parallel bus
    • B. serial bus
    • C. data bus
    • D. memory bus
    • Discuss
    • 8. When an IC has two rows of parallel connecting pins, the device is referred to as a:

    • Options
    • A. QFP
    • B. DIP
    • C. TSSOP
    • D. CMOS
    • Discuss
    • 9. Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector.

    • Options
    • A. positive, negative
    • B. positive, positive
    • C. negative, positive
    • D. negative, negative
    • Discuss
    • 10. What is the period of a clock waveform that has a frequency of 15.4 kHz?

    • Options
    • A. 649 µs
    • B. 6.49 µs
    • C. 64.9 µs
    • D. 0.649 µs
    • Discuss


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