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  • Question

  • 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

  • Correct Answer
  • iron-core 

    • Transformers problems

    Search Results

    • 1. 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
    • 2. 

      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
    • 3. 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
    • 4. ___ occurs in a transformer when some of the primary flux lines pass through the air instead of the core.

    • Options
    • A. Hysteresis loss
    • B. Magnetic flux leakage
    • C. Winding resistance
    • D. Winding capacitance
      • Discuss
    • 5. A step-up transformer will ___ to the secondary.

    • Options
    • A. increase the current
    • B. increase the voltage
    • C. increase the power
    • D. decrease the voltage
      • Discuss
    • 6. 

      The voltage V2 is _____ in the given circuit.


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


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

    • Options
    • A. autotransformer
    • B. center-tapped transformer
    • C. multiple-tap transformer
    • D. multiple-winding transformer
      • Discuss
    • 8. A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. 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
    • 10. Base currents are usually small because of the physical construction of the thin and lightly doped base.

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

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