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Home ‣ Digital Electronics ‣ Signals and Switches Comments
  • Question

  • 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

  • Correct Answer
  • positive, negative 

    • Signals and Switches problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. The period of a waveform is the percentage of time the signal is HIGH.

    • Options
    • A. True
    • B. False
      • 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. 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
    • 7. Determine the voltage on the collector Vc of the given transistor circuit.


    • Options
    • A. 0 V
    • B. +10 V
    • C. +4.7 V
    • D. +0.5 V
      • Discuss
    • 8. Determine if diodes D1 and D2 in the given figure are forward or reverse biased.


    • Options
    • A. D1 forward and D2 reverse
    • B. D2 forward and D1 reverse
    • C. D1 and D2 reverse
    • D. D1 and D2 forward
      • Discuss
    • 9. How long will it take to serially transmit the hexadecimal number C316 if the clock frequency is 1.5 MHz?

    • Options
    • A. 4.69 ms
    • B. 4.69 µs
    • C. 5.33 ms
    • D. 5.33 µs
      • Discuss
    • 10. What is the minimum voltage required before a diode will allow current to flow between the cathode and the anode?

    • Options
    • A. 0.7 V
    • B. 0.07 V
    • C. 4.3 V
    • D. 0.2 V
      • Discuss

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