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Home ‣ Electronics ‣ Thyristors and Tranducers Comments
  • Question

  • What does a hall effect sensor sense?


  • Options
  • A. temperature
  • B. moisture
  • C. magnetic fields
  • D. pressure

  • Correct Answer
  • magnetic fields 

    • Thyristors and Tranducers problems

    Search Results

    • 1. Once a DIAC is conducting, the only way to turn it off is with:

    • Options
    • A. a positive gate voltage
    • B. a negative gate voltage
    • C. low-current dropout
    • D. breakover
      • Discuss
    • 2. With a PNP circuit, the most positive voltage is probably:

    • Options
    • A. ground
    • B. VC
    • C. VBE
    • D. VCC
      • Discuss
    • 3. If an input signal ranges from 20?40 µA (microamps), with an output signal ranging from .5?1.5 mA (milliamps), what is the ac beta?

    • Options
    • A. 0.05
    • B. 20
    • C. 50
    • D. 500
      • Discuss
    • 4. Which is the higher gain provided by a C-E configuration?

    • Options
    • A. voltage
    • B. current
    • C. resistance
    • D. power
      • Discuss
    • 5. A collector characteristic curve is a graph showing:

    • Options
    • A. emitter current (IE) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant
    • B. collector current (IC) versus collector-emitter voltage (VCE) with (VBB) base bias voltage held constant
    • C. collector current (IC) versus collector-emitter voltage (VC) with (VBB) base bias voltage held constant
    • D. collector current (IC) versus collector-emitter voltage (VCC) with (VBB) base bias voltage held constant
      • Discuss
    • 6. The only way to close an SCR is with:

    • Options
    • A. a trigger input applied to the gate
    • B. forward breakover voltage
    • C. low-current dropout
    • D. valley voltage
      • Discuss
    • 7. What type of application would use a photovoltaic cell?

    • Options
    • A. an automobile horn
    • B. a TI 92 calculator
    • C. a magnetic field detector
    • D. a remote power source
      • Discuss
    • 8. The DIAC is a:

    • Options
    • A. transistor
    • B. unidirectional device
    • C. three-layer device
    • D. bidirectional device
      • Discuss
    • 9. When checking a good SCR or TRIAC with an ohmmeter it will:

    • Options
    • A. show high resistance in both directions
    • B. show low resistance with positive on anode and negative on cathode, and high resistance when reversed
    • C. show high resistance with negative on anode and positive on cathode, and low resistance when reversed
    • D. show low resistance in both directions
      • Discuss
    • 10. Which is the seven-segment display?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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