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Signals and Switches (Digital Electronics) Question and Answers-Page first

Signals and Switches problems


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

  • Options
  • A. True
  • B. False

  •           Discuss     

  • 2. 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     

  • 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. 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     

  • 5. 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     

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

  • Options
  • A. True
  • B. False

  •           Discuss     

  • 7. What is the output voltage from the circuit in the given figure?

    Digital Electronics Signals and Switches: 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     

  • 8. 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     

  • 9. 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     

  • 10. 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     


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