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  • Question

  • 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

  • Correct Answer
  • impedance matching 

    • Transformers problems

    Search Results

    • 1. ___ 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
    • 2. 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
    • 3. 

      The secondary current is _____ in the given circuit.


    • Options
    • A. 1.9 mA
    • B. 7.5 mA
    • C. 30 mA
    • D. 60 mA
      • Discuss
    • 4. ___ is the concept of one coil inducing a voltage into another coil.

    • Options
    • A. Electrical isolation
    • B. Self-inductance
    • C. Mutual inductance
    • D. Coefficient of coupling
      • Discuss
    • 5. A transformer turns ratio of ________ will be needed to match an output impedance of 5 kΩ to an 8 Ω speaker.

    • Options
    • A. 5:1
    • B. 8:1
    • C. 25:1
    • D. 625:1
      • Discuss
    • 6. 

      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
    • 7. 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
    • 8. 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
    • 9. 

      The voltage V2 is _____ in the given circuit.


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


      • Discuss
    • 10. 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

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