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Signals and Switches problems

  • 1. What is a disadvantage of CMOS in place of TTL?

  • Options
  • A. It switches slower.
  • B. It uses less power.
  • C. It is smaller.
  • D. cost
    • Discuss
  • 2. Why, in most applications, are transistor switches used in place of relays?

  • Options
  • A. They consume less power.
  • B. They are faster.
  • C. They are quieter and smaller.
  • D. all of the above
    • Discuss
  • 3. If the input voltage on the base of the transistor in the given figure is changed to +10 V, what is the new voltage at the collector Vc?

    Digital Electronics Signals and Switches: If the input voltage on the base of the transistor in the given figure is changed to +10 V, what is


  • Options
  • A. Not enough information is provided.
  • B. Vc = 10 V
  • C. Vc = 0 V
  • D. Vc = 5 V
    • Discuss
  • 4. Why is the given circuit called an inverter?

    Digital Electronics Signals and Switches: Why is the given circuit called an inverter?


  • Options
  • A. The output is the opposite (inverse) of the input.
  • B. The output is in phase with the input.
  • C. The output is the same as the input.
  • D. There is no output.
    • Discuss
  • 5. Why is parallel data transmission preferred over serial data transmission for most applications?

  • Options
  • A. It is much slower.
  • B. It is cheaper.
  • C. More people use it.
  • D. It is much faster.
    • Discuss
  • 6. An indication of cutoff in an NPN bipolar transistor is that the:

  • Options
  • A. collector current is maximum
  • B. collector-to-emitter voltage equals zero
  • C. base-to-emitter voltage equals 0.7 V
  • D. collector to emitter appears to be open
    • Discuss
  • 7. Why does the TTL family use a totem-pole circuit on the output?

  • Options
  • A. It provides active pull-up.
  • B. It provides active pull-down.
  • C. It provides active pull-up and active pull-down.
    • Discuss
  • 8. What is used to graphically show the time relationship between two or more digital waveforms?

  • Options
  • A. reference diagram
  • B. timing diagram
  • C. voltage curve
  • D. load line
    • Discuss
  • 9. What is the advantage of using CMOS logic over TTL?

  • Options
  • A. It switches faster.
  • B. It uses less power.
  • C. It is larger.
  • D. cost
    • Discuss
  • 10. What is the frequency of a clock waveform if the period of that waveform is
    1.25 µs?

  • Options
  • A. 8 kHz
  • B. 0.8 kHz
  • C. 0.8 MHz
  • D. 8 MHz
    • Discuss

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