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  • Question

  • A(n) ___ is sometimes constructed as a variable transformer.


  • Options
  • A. autotransformer
  • B. center-tapped transformer
  • C. multiple-tap transformer
  • D. multiple-winding transformer

  • Correct Answer
  • autotransformer 

    • Transformers problems

    Search Results

    • 1. 

      The voltage V2 is _____ in the given circuit.


    • Options
    • A. 36.7 V
    • B. 73.3 V
    • C. 110 V
    • D. 220 V


      • Discuss
    • 2. A(n) _____ transformer is usually used for audio or power applications.

    • Options
    • A. iron-core
    • B. air-core
    • C. ferrite-core
    • D. All of the above
      • Discuss
    • 3. To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________.

    • Options
    • A. EI core
    • B. iron core
    • C. common core
    • D. CI core
      • Discuss
    • 4. 

      The reflected resistance is ___ as seen by the source in the given circu.


    • Options
    • A. 150 Ω
    • B. 300 Ω
    • C. 600 Ω
    • D. 2.4 kΩ
      • Discuss
    • 5. Making the load resistance appear the same as the source's internal resistance is called _____.

    • Options
    • A. maximum power transfer
    • B. reflected resistance
    • C. impedance matching
    • D. reflected load
      • Discuss
    • 6. A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. A decrease in base current of a CE amplifier causes the voltage measured between the emitter and the collector to increase.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Base currents are usually small because of the physical construction of the thin and lightly doped base.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The beta of a BJT is the ratio of collector current to emitter current.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. A practical CE amplifier has the input on the base and the output taken off the emitter.

    • Options
    • A. True
    • B. False
      • Discuss

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