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Home ‣ Electronics ‣ Transformers Comments
  • Question

  • 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

  • Correct Answer
  • 25:1 

    • Transformers problems

    Search Results

    • 1. For mutual inductance to occur, the two coils must be at right angles to each other.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. 

      In the given circuit, Maximum power is being transferred to the load.


    • Options
    • A. True
    • B. False
      • Discuss
    • 3. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. If voltage is stepped-up to the secondary, current will be stepped-down by the same amount.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. An open secondary winding of a transformer will cause the primary current to be nearly zero.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. ___ 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
    • 7. 

      The secondary current is _____ in the given circuit.


    • Options
    • A. 1.9 mA
    • B. 7.5 mA
    • C. 30 mA
    • D. 60 mA
      • Discuss
    • 8. 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
    • 9. ___ 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
    • 10. 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

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