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Home ‣ Electronics ‣ Thyristors and Tranducers Comments
  • Question

  • What is an SCR?


  • Options
  • A. a PNPN thyristor with 3 terminals
  • B. a PNPN thyristor with 4 terminals
  • C. a PNP thyristor with 3 terminals
  • D. an NPN thyristor with 3 terminals

  • Correct Answer
  • a PNPN thyristor with 3 terminals 

    • Thyristors and Tranducers problems

    Search Results

    • 1. Which is the seven-segment display?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 2. 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
    • 3. The DIAC is a:

    • Options
    • A. transistor
    • B. unidirectional device
    • C. three-layer device
    • D. bidirectional device
      • Discuss
    • 4. 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
    • 5. 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
    • 6. Which is the DIAC?

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. A TRIAC:

    • Options
    • A. can trigger only on positive gate voltages
    • B. can trigger only on negative gate voltages
    • C. cannot be triggered with gate voltages
    • D. can be triggered by either a positive or a negative gate voltage
      • Discuss
    • 8. A UJT has:

    • Options
    • A. two base leads
    • B. one emitter lead
    • C. two emitter leads and one base lead
    • D. one emitter lead and two base leads
      • Discuss
    • 9. A transducer's function is to:

    • Options
    • A. transmit electrical energy
    • B. convert energy
    • C. produce mechanical energy
    • D. prevent current flow
      • Discuss
    • 10. The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:

    • Options
    • A. maximum forward current
    • B. maximum forward gate current
    • C. holding current
    • D. reverse gate leakage current
      • Discuss

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